20651654988 has 18 divisors (see below), whose sum is σ = 52202794644. Its totient is φ = 6883884984.

The previous prime is 20651654879. The next prime is 20651655041. The reversal of 20651654988 is 88945615602.

20651654988 is a `hidden beast` number, since 2 + 0 + 6 + 5 + 16 + 549 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 286828506 + ... + 286828577.

It is an arithmetic number, because the mean of its divisors is an integer number (2900155258).

Almost surely, 2^20651654988 is an apocalyptic number.

It is an amenable number.

20651654988 is an abundant number, since it is smaller than the sum of its proper divisors (31551139656).

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

20651654988 is a wasteful number, since it uses less digits than its factorization.

20651654988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573657093 (or 573657088 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 20651654988 in words is "twenty billion, six hundred fifty-one million, six hundred fifty-four thousand, nine hundred eighty-eight".