20531132555 has 4 divisors (see below), whose sum is σ = 24637359072. Its totient is φ = 16424906040.

The previous prime is 20531132549. The next prime is 20531132579. The reversal of 20531132555 is 55523113502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20531132555 - 2²⁰ = 20530083979 is a prime.

It is a Duffinian 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, 2053113251 + ... + 2053113260.

It is an arithmetic number, because the mean of its divisors is an integer number (6159339768).

Almost surely, 2^20531132555 is an apocalyptic number.

20531132555 is a deficient number, since it is larger than the sum of its proper divisors (4106226517).

20531132555 is an equidigital number, since it uses as much as digits as its factorization.

20531132555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4106226516.

The product of its (nonzero) digits is 22500, while the sum is 32.

The spelling of 20531132555 in words is "twenty billion, five hundred thirty-one million, one hundred thirty-two thousand, five hundred fifty-five".