20958579936 has 72 divisors (see below), whose sum is σ = 68115391344. Its totient is φ = 5988165120.

The previous prime is 20958579919. The next prime is 20958579949. The reversal of 20958579936 is 63997585902.

20958579936 is a `hidden beast` number, since 2 + 0 + 9 + 58 + 579 + 9 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-3 number, since 3×20958579936³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5196045 + ... + 5200076.

It is an arithmetic number, because the mean of its divisors is an integer number (946047102).

Almost surely, 2^20958579936 is an apocalyptic number.

It is an amenable number.

20958579936 is an abundant number, since it is smaller than the sum of its proper divisors (47156811408).

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

20958579936 is a wasteful number, since it uses less digits than its factorization.

20958579936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10396144 (or 10396133 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 63.

The spelling of 20958579936 in words is "twenty billion, nine hundred fifty-eight million, five hundred seventy-nine thousand, nine hundred thirty-six".