20311332400 has 30 divisors (see below), whose sum is σ = 48797977052. Its totient is φ = 8124532800.

The previous prime is 20311332347. The next prime is 20311332469. The reversal of 20311332400 is 423311302.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25388766 + ... + 25389565.

Almost surely, 2^20311332400 is an apocalyptic number.

20311332400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311332400 is an abundant number, since it is smaller than the sum of its proper divisors (28486644652).

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

20311332400 is a wasteful number, since it uses less digits than its factorization.

20311332400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50778349 (or 50778338 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20311332400 its reverse (423311302), we get a palindrome (20734643702).

The spelling of 20311332400 in words is "twenty billion, three hundred eleven million, three hundred thirty-two thousand, four hundred".