20531554455 has 16 divisors (see below), whose sum is σ = 32922381024. Its totient is φ = 10926197760.

The previous prime is 20531554427. The next prime is 20531554471. The reversal of 20531554455 is 55445513502.

It is not a de Polignac number, because 20531554455 - 2⁶ = 20531554391 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1490706 + ... + 1504415.

It is an arithmetic number, because the mean of its divisors is an integer number (2057648814).

Almost surely, 2^20531554455 is an apocalyptic number.

20531554455 is a deficient number, since it is larger than the sum of its proper divisors (12390826569).

20531554455 is a wasteful number, since it uses less digits than its factorization.

20531554455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995586.

The product of its (nonzero) digits is 300000, while the sum is 39.

The spelling of 20531554455 in words is "twenty billion, five hundred thirty-one million, five hundred fifty-four thousand, four hundred fifty-five".