20556153720 has 48 divisors (see below), whose sum is σ = 66807500760. Its totient is φ = 5481640896.

The previous prime is 20556153719. The next prime is 20556153727. The reversal of 20556153720 is 2735165502.

20556153720 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 615 + 37 + 2 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556153727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28549854 + ... + 28550573.

Almost surely, 2^20556153720 is an apocalyptic number.

20556153720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20556153720 is an abundant number, since it is smaller than the sum of its proper divisors (46251347040).

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

20556153720 is a wasteful number, since it uses less digits than its factorization.

20556153720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57100444 (or 57100437 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The spelling of 20556153720 in words is "twenty billion, five hundred fifty-six million, one hundred fifty-three thousand, seven hundred twenty".