31323032020 has 48 divisors (see below), whose sum is σ = 76019973120. Its totient is φ = 10618654464.

The previous prime is 31323031991. The next prime is 31323032023. The reversal of 31323032020 is 2023032313.

It is a happy number.

It is a super-2 number, since 2×31323032020² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323032023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1244484 + ... + 1269403.

It is an arithmetic number, because the mean of its divisors is an integer number (1583749440).

Almost surely, 2^31323032020 is an apocalyptic number.

It is an amenable number.

31323032020 is an abundant number, since it is smaller than the sum of its proper divisors (44696941100).

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

31323032020 is a wasteful number, since it uses less digits than its factorization.

31323032020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513992 (or 2513990 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 31323032020 its reverse (2023032313), we get a palindrome (33346064333).

The spelling of 31323032020 in words is "thirty-one billion, three hundred twenty-three million, thirty-two thousand, twenty".