20311223331 has 64 divisors (see below), whose sum is σ = 33652039680. Its totient is φ = 10631331840.

The previous prime is 20311223327. The next prime is 20311223447. The reversal of 20311223331 is 13332211302.

It is not a de Polignac number, because 20311223331 - 2² = 20311223327 is a prime.

It is a super-2 number, since 2×20311223331² (a number of 21 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 20311223298 and 20311223307.

It is not an unprimeable number, because it can be changed into a prime (20311223311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7009675 + ... + 7012571.

It is an arithmetic number, because the mean of its divisors is an integer number (525813120).

Almost surely, 2^20311223331 is an apocalyptic number.

20311223331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20311223331 is a deficient number, since it is larger than the sum of its proper divisors (13340816349).

20311223331 is a wasteful number, since it uses less digits than its factorization.

20311223331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444.

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

Adding to 20311223331 its reverse (13332211302), we get a palindrome (33643434633).

The spelling of 20311223331 in words is "twenty billion, three hundred eleven million, two hundred twenty-three thousand, three hundred thirty-one".