20531351255 has 16 divisors (see below), whose sum is σ = 25470518304. Its totient is φ = 15877693440.

The previous prime is 20531351233. The next prime is 20531351273. The reversal of 20531351255 is 55215313502.

It is a de Polignac number, because none of the positive numbers 2^k-20531351255 is a prime.

It is a Duffinian number.

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, 471386 + ... + 513095.

It is an arithmetic number, because the mean of its divisors is an integer number (1591907394).

Almost surely, 2^20531351255 is an apocalyptic number.

20531351255 is a deficient number, since it is larger than the sum of its proper divisors (4939167049).

20531351255 is an equidigital number, since it uses as much as digits as its factorization.

20531351255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984626.

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

Adding to 20531351255 its reverse (55215313502), we get a palindrome (75746664757).

The spelling of 20531351255 in words is "twenty billion, five hundred thirty-one million, three hundred fifty-one thousand, two hundred fifty-five".