20555644655502 has 64 divisors (see below), whose sum is σ = 51998468728320. Its totient is φ = 5958157867200.

The previous prime is 20555644655471. The next prime is 20555644655551.

It is a happy number.

20555644655502 is a `hidden beast` number, since 2 + 0 + 55 + 56 + 446 + 55 + 50 + 2 = 666.

20555644655502 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 752278999 + ... + 752306322.

It is an arithmetic number, because the mean of its divisors is an integer number (812476073880).

Almost surely, 2^{20555644655502} is an apocalyptic number.

20555644655502 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20555644655502 is an abundant number, since it is smaller than the sum of its proper divisors (31442824072818).

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

20555644655502 is a wasteful number, since it uses less digits than its factorization.

20555644655502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504585366 (or 1504585360 counting only the distinct ones).

The product of its (nonzero) digits is 36000000, while the sum is 54.

The spelling of 20555644655502 in words is "twenty trillion, five hundred fifty-five billion, six hundred forty-four million, six hundred fifty-five thousand, five hundred two".