20986479812568 has 32 divisors (see below), whose sum is σ = 55552446563760. Its totient is φ = 6583993666560.

The previous prime is 20986479812509. The next prime is 20986479812587. The reversal of 20986479812568 is 86521897468902.

It is a self number, because there is not a number n which added to its sum of digits gives 20986479812568.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25718724853 + ... + 25718725668.

Almost surely, 2^{20986479812568} is an apocalyptic number.

It is an amenable number.

20986479812568 is an abundant number, since it is smaller than the sum of its proper divisors (34565966751192).

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

20986479812568 is a wasteful number, since it uses less digits than its factorization.

20986479812568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51437450547 (or 51437450543 counting only the distinct ones).

The product of its (nonzero) digits is 836075520, while the sum is 75.

The spelling of 20986479812568 in words is "twenty trillion, nine hundred eighty-six billion, four hundred seventy-nine million, eight hundred twelve thousand, five hundred sixty-eight".