31040032020 has 48 divisors (see below), whose sum is σ = 88209296448. Its totient is φ = 8153798400.

The previous prime is 31040031973. The next prime is 31040032021. The reversal of 31040032020 is 2023004013.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31040032021) 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, 3856681 + ... + 3864720.

It is an arithmetic number, because the mean of its divisors is an integer number (1837693676).

Almost surely, 2^31040032020 is an apocalyptic number.

31040032020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31040032020 is an abundant number, since it is smaller than the sum of its proper divisors (57169264428).

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

31040032020 is a wasteful number, since it uses less digits than its factorization.

31040032020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7721480 (or 7721478 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 31040032020 its reverse (2023004013), we get a palindrome (33063036033).

The spelling of 31040032020 in words is "thirty-one billion, forty million, thirty-two thousand, twenty".