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20631000015 = 3253761712861
BaseRepresentation
bin10011001101101101…
…000001001111001111
31222020210212101112200
4103031231001033033
5314223014000030
613251105532543
71330153415043
oct231555011717
958223771480
1020631000015
11882773073a
123bb9344153
131c3a338722
14dda01c023
1580b35dd60
hex4cdb413cf

20631000015 has 96 divisors (see below), whose sum is σ = 37867969152. Its totient is φ = 10378368000.

The previous prime is 20631000007. The next prime is 20631000031. The reversal of 20631000015 is 51000013602.

20631000015 is a `hidden beast` number, since 20 + 631 + 0 + 0 + 0 + 0 + 15 = 666.

20631000015 is a nontrivial binomial coefficient, being equal to C(203131, 2).

It is not a de Polignac number, because 20631000015 - 23 = 20631000007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7209685 + ... + 7212545.

It is an arithmetic number, because the mean of its divisors is an integer number (394458012).

Almost surely, 220631000015 is an apocalyptic number.

20631000015 is the 203130-th triangular number.

20631000015 is a deficient number, since it is larger than the sum of its proper divisors (17236969137).

20631000015 is a wasteful number, since it uses less digits than its factorization.

20631000015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3041 (or 3038 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 20631000015 its reverse (51000013602), we get a palindrome (71631013617).

The spelling of 20631000015 in words is "twenty billion, six hundred thirty-one million, fifteen", and thus it is an aban number.

Divisors: 1 3 5 9 15 37 45 61 71 111 183 185 213 305 333 355 549 555 639 915 1065 1665 2257 2627 2745 2861 3195 4331 6771 7881 8583 11285 12993 13135 14305 20313 21655 23643 25749 33855 38979 39405 42915 64965 101565 105857 118215 128745 160247 174521 194895 203131 317571 480741 523563 529285 609393 801235 872605 952713 1015655 1442223 1570689 1587855 1828179 2403705 2617815 3046965 4763565 6457277 7211115 7515847 7853445 9140895 12390991 19371831 22547541 32286385 37172973 37579235 58115493 61954955 67642623 96859155 111518919 112737705 185864865 290577465 338213115 458466667 557594595 1375400001 2292333335 4126200003 6877000005 20631000015