20311231111400 has 96 divisors (see below), whose sum is σ = 48502116395040. Its totient is φ = 7904554594560.

The previous prime is 20311231111273. The next prime is 20311231111513. The reversal of 20311231111400 is 411113211302.

It is a super-2 number, since 2×20311231111400² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213568259 + ... + 213663341.

It is an arithmetic number, because the mean of its divisors is an integer number (505230379115).

Almost surely, 2^{20311231111400} is an apocalyptic number.

20311231111400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311231111400 is an abundant number, since it is smaller than the sum of its proper divisors (28190885283640).

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

20311231111400 is a wasteful number, since it uses less digits than its factorization.

20311231111400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124003 (or 123994 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20311231111400 its reverse (411113211302), we get a palindrome (20722344322702).

The spelling of 20311231111400 in words is "twenty trillion, three hundred eleven billion, two hundred thirty-one million, one hundred eleven thousand, four hundred".