20312021132 has 12 divisors (see below), whose sum is σ = 38280347616. Its totient is φ = 9374778960.

The previous prime is 20312021131. The next prime is 20312021153. The reversal of 20312021132 is 23112021302.

It is a super-2 number, since 2×20312021132² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20312021132.

It is not an unprimeable number, because it can be changed into a prime (20312021131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195307844 + ... + 195307947.

It is an arithmetic number, because the mean of its divisors is an integer number (3190028968).

Almost surely, 2^20312021132 is an apocalyptic number.

It is an amenable number.

20312021132 is a deficient number, since it is larger than the sum of its proper divisors (17968326484).

20312021132 is a wasteful number, since it uses less digits than its factorization.

20312021132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390615808 (or 390615806 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20312021132 its reverse (23112021302), we get a palindrome (43424042434).

The spelling of 20312021132 in words is "twenty billion, three hundred twelve million, twenty-one thousand, one hundred thirty-two".