20504055531 has 16 divisors (see below), whose sum is σ = 28082797088. Its totient is φ = 13297478400.

The previous prime is 20504055511. The next prime is 20504055563. The reversal of 20504055531 is 13555040502.

It is a happy number.

It is not a de Polignac number, because 20504055531 - 2⁵ = 20504055499 is a prime.

It is a super-2 number, since 2×20504055531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20504055511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739071 + ... + 766311.

It is an arithmetic number, because the mean of its divisors is an integer number (1755174818).

Almost surely, 2^20504055531 is an apocalyptic number.

20504055531 is a deficient number, since it is larger than the sum of its proper divisors (7578741557).

20504055531 is a wasteful number, since it uses less digits than its factorization.

20504055531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34062.

The product of its (nonzero) digits is 15000, while the sum is 30.

The spelling of 20504055531 in words is "twenty billion, five hundred four million, fifty-five thousand, five hundred thirty-one".