20311031320 has 64 divisors (see below), whose sum is σ = 46561767840. Its totient is φ = 7972608000.

The previous prime is 20311031309. The next prime is 20311031327. The reversal of 20311031320 is 2313011302.

It is a junction number, because it is equal to n+sod(n) for n = 20311031294 and 20311031303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311031327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434275 + ... + 478765.

Almost surely, 2^20311031320 is an apocalyptic number.

20311031320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311031320 is an abundant number, since it is smaller than the sum of its proper divisors (26250736520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311031320 is a wasteful number, since it uses less digits than its factorization.

20311031320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44716 (or 44712 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20311031320 its reverse (2313011302), we get a palindrome (22624042622).

The spelling of 20311031320 in words is "twenty billion, three hundred eleven million, thirty-one thousand, three hundred twenty".