20311312032 has 96 divisors (see below), whose sum is σ = 64626932160. Its totient is φ = 6154940160.

The previous prime is 20311312027. The next prime is 20311312103. The reversal of 20311312032 is 23021311302.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×20311312032² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20311311996 and 20311312014.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1059063 + ... + 1078070.

It is an arithmetic number, because the mean of its divisors is an integer number (673197210).

Almost surely, 2^20311312032 is an apocalyptic number.

20311312032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20311312032 is an abundant number, since it is smaller than the sum of its proper divisors (44315620128).

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

20311312032 is a wasteful number, since it uses less digits than its factorization.

20311312032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137163 (or 2137149 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20311312032 its reverse (23021311302), we get a palindrome (43332623334).

The spelling of 20311312032 in words is "twenty billion, three hundred eleven million, three hundred twelve thousand, thirty-two".