20556555495 has 32 divisors (see below), whose sum is σ = 37785968640. Its totient is φ = 9348072960.

The previous prime is 20556555433. The next prime is 20556555511. The reversal of 20556555495 is 59455565502.

It is not a de Polignac number, because 20556555495 - 2⁹ = 20556554983 is a prime.

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, 492450 + ... + 532559.

It is an arithmetic number, because the mean of its divisors is an integer number (1180811520).

Almost surely, 2^20556555495 is an apocalyptic number.

20556555495 is a deficient number, since it is larger than the sum of its proper divisors (17229413145).

20556555495 is a wasteful number, since it uses less digits than its factorization.

20556555495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025215.

The product of its (nonzero) digits is 6750000, while the sum is 51.

The spelling of 20556555495 in words is "twenty billion, five hundred fifty-six million, five hundred fifty-five thousand, four hundred ninety-five".