20626912728 has 48 divisors (see below), whose sum is σ = 55989063000. Its totient is φ = 6860313600.

The previous prime is 20626912717. The next prime is 20626912741. The reversal of 20626912728 is 82721962602.

20626912728 is a `hidden beast` number, since 2 + 0 + 626 + 9 + 12 + 7 + 2 + 8 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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, 286698 + ... + 351353.

Almost surely, 2^20626912728 is an apocalyptic number.

It is an amenable number.

20626912728 is an abundant number, since it is smaller than the sum of its proper divisors (35362150272).

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

20626912728 is a wasteful number, since it uses less digits than its factorization.

20626912728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638512 (or 638505 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 20626912728 in words is "twenty billion, six hundred twenty-six million, nine hundred twelve thousand, seven hundred twenty-eight".