31345020 has 72 divisors (see below), whose sum is σ = 108667104. Its totient is φ = 7164288.

The previous prime is 31345019. The next prime is 31345049. The reversal of 31345020 is 2054313.

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 = 31344984 and 31345002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11179 + ... + 13698.

Almost surely, 2^31345020 is an apocalyptic number.

31345020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31345020 is an abundant number, since it is smaller than the sum of its proper divisors (77322084).

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

31345020 is a wasteful number, since it uses less digits than its factorization.

31345020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24899 (or 24894 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 31345020 is about 5598.6623402381. The cubic root of 31345020 is about 315.2991866424.

Adding to 31345020 its reverse (2054313), we get a palindrome (33399333).

The spelling of 31345020 in words is "thirty-one million, three hundred forty-five thousand, twenty".