20638255788 has 24 divisors (see below), whose sum is σ = 53506589360. Its totient is φ = 6879418560.

The previous prime is 20638255763. The next prime is 20638255793. The reversal of 20638255788 is 88755283602.

20638255788 is a `hidden beast` number, since 2 + 0 + 6 + 3 + 8 + 2 + 557 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 95547373 + ... + 95547588.

Almost surely, 2^20638255788 is an apocalyptic number.

It is an amenable number.

20638255788 is an abundant number, since it is smaller than the sum of its proper divisors (32868333572).

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

20638255788 is a wasteful number, since it uses less digits than its factorization.

20638255788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191094974 (or 191094966 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 20638255788 in words is "twenty billion, six hundred thirty-eight million, two hundred fifty-five thousand, seven hundred eighty-eight".