31331342020 has 24 divisors (see below), whose sum is σ = 71777256768. Its totient is φ = 11393215200.

The previous prime is 31331341963. The next prime is 31331342027. The reversal of 31331342020 is 2024313313.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31331341982 and 31331342000.

It is not an unprimeable number, because it can be changed into a prime (31331342027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71207376 + ... + 71207815.

It is an arithmetic number, because the mean of its divisors is an integer number (2990719032).

Almost surely, 2^31331342020 is an apocalyptic number.

It is an amenable number.

31331342020 is an abundant number, since it is smaller than the sum of its proper divisors (40445914748).

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

31331342020 is a wasteful number, since it uses less digits than its factorization.

31331342020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142415211 (or 142415209 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 31331342020 its reverse (2024313313), we get a palindrome (33355655333).

The spelling of 31331342020 in words is "thirty-one billion, three hundred thirty-one million, three hundred forty-two thousand, twenty".