20213131323 has 64 divisors (see below), whose sum is σ = 36232519680. Its totient is φ = 9704966400.

The previous prime is 20213131307. The next prime is 20213131327. The reversal of 20213131323 is 32313131202.

It is not a de Polignac number, because 20213131323 - 2⁴ = 20213131307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20213131323.

It is not an unprimeable number, because it can be changed into a prime (20213131327) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 123786 + ... + 236112.

It is an arithmetic number, because the mean of its divisors is an integer number (566133120).

Almost surely, 2^20213131323 is an apocalyptic number.

20213131323 is a deficient number, since it is larger than the sum of its proper divisors (16019388357).

20213131323 is a wasteful number, since it uses less digits than its factorization.

20213131323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112408.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 20213131323 its reverse (32313131202), we get a palindrome (52526262525).

The spelling of 20213131323 in words is "twenty billion, two hundred thirteen million, one hundred thirty-one thousand, three hundred twenty-three".