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20669245340 = 2251947153077
BaseRepresentation
bin10011001111111110…
…111010011110011100
31222100110211110021012
4103033332322132130
5314312311322330
613254553354352
71331126454332
oct231776723634
958313743235
1020669245340
118847282a47
12400a1089b8
131c452396b3
141001135b52
1580e8b5c95
hex4cffba79c

20669245340 has 24 divisors (see below), whose sum is σ = 43408462272. Its totient is φ = 8267117760.

The previous prime is 20669245327. The next prime is 20669245349. The reversal of 20669245340 is 4354296602.

It is a super-2 number, since 2×206692453402 (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20669245349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362882 + ... + 415958.

It is an arithmetic number, because the mean of its divisors is an integer number (1808685928).

Almost surely, 220669245340 is an apocalyptic number.

20669245340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20669245340 is an abundant number, since it is smaller than the sum of its proper divisors (22739216932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20669245340 is a wasteful number, since it uses less digits than its factorization.

20669245340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72557 (or 72555 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 20669245340 in words is "twenty billion, six hundred sixty-nine million, two hundred forty-five thousand, three hundred forty".

Divisors: 1 2 4 5 10 20 19471 38942 53077 77884 97355 106154 194710 212308 265385 389420 530770 1061540 1033462267 2066924534 4133849068 5167311335 10334622670 20669245340