20312131255 has 16 divisors (see below), whose sum is σ = 26520145344. Its totient is φ = 14845086720.

The previous prime is 20312131219. The next prime is 20312131261. The reversal of 20312131255 is 55213121302.

It is not a de Polignac number, because 20312131255 - 2¹¹ = 20312129207 is a prime.

It is a super-2 number, since 2×20312131255² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1604491 + ... + 1617100.

It is an arithmetic number, because the mean of its divisors is an integer number (1657509084).

Almost surely, 2^20312131255 is an apocalyptic number.

20312131255 is a deficient number, since it is larger than the sum of its proper divisors (6208014089).

20312131255 is a wasteful number, since it uses less digits than its factorization.

20312131255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221706.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20312131255 its reverse (55213121302), we get a palindrome (75525252557).

The spelling of 20312131255 in words is "twenty billion, three hundred twelve million, one hundred thirty-one thousand, two hundred fifty-five".