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20115000751 = 137216167943
BaseRepresentation
bin10010101110111100…
…101000110110101111
31220220211220220121211
4102232330220312233
5312143420011001
613123554135251
71311316454026
oct225674506657
956824826554
1020115000751
11859243686a
123a94581527
131b87471211
14d8b69d8bd
157cadd5351
hex4aef28daf

20115000751 has 8 divisors (see below), whose sum is σ = 20271500064. Its totient is φ = 19958641920.

The previous prime is 20115000743. The next prime is 20115000799. The reversal of 20115000751 is 15700051102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20115000751 - 23 = 20115000743 is a prime.

It is a super-2 number, since 2×201150007512 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115000701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262086 + ... + 330028.

It is an arithmetic number, because the mean of its divisors is an integer number (2533937508).

Almost surely, 220115000751 is an apocalyptic number.

20115000751 is the 89700-th centered pentagonal number.

20115000751 is a deficient number, since it is larger than the sum of its proper divisors (156499313).

20115000751 is a wasteful number, since it uses less digits than its factorization.

20115000751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70241.

The product of its (nonzero) digits is 350, while the sum is 22.

Adding to 20115000751 its reverse (15700051102), we get a palindrome (35815051853).

The spelling of 20115000751 in words is "twenty billion, one hundred fifteen million, seven hundred fifty-one", and thus it is an aban number.

Divisors: 1 137 2161 67943 296057 9308191 146824823 20115000751