20657055700 has 36 divisors (see below), whose sum is σ = 45051109600. Its totient is φ = 8221292640.

The previous prime is 20657055659. The next prime is 20657055767. The reversal of 20657055700 is 755075602.

It is a self number, because there is not a number n which added to its sum of digits gives 20657055700.

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, 499122 + ... + 538921.

Almost surely, 2^20657055700 is an apocalyptic number.

20657055700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20657055700 is an abundant number, since it is smaller than the sum of its proper divisors (24394053900).

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

20657055700 is a wasteful number, since it uses less digits than its factorization.

20657055700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038256 (or 1038249 counting only the distinct ones).

The product of its (nonzero) digits is 73500, while the sum is 37.

The spelling of 20657055700 in words is "twenty billion, six hundred fifty-seven million, fifty-five thousand, seven hundred".