20555655520 has 24 divisors (see below), whose sum is σ = 48562736544. Its totient is φ = 8222262144.

The previous prime is 20555655517. The next prime is 20555655541. The reversal of 20555655520 is 2555655502.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64236264 + ... + 64236583.

It is an arithmetic number, because the mean of its divisors is an integer number (2023447356).

Almost surely, 2^20555655520 is an apocalyptic number.

20555655520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20555655520 is an abundant number, since it is smaller than the sum of its proper divisors (28007081024).

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

20555655520 is a wasteful number, since it uses less digits than its factorization.

20555655520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128472862 (or 128472854 counting only the distinct ones).

The product of its (nonzero) digits is 375000, while the sum is 40.

The spelling of 20555655520 in words is "twenty billion, five hundred fifty-five million, six hundred fifty-five thousand, five hundred twenty".