31057020 has 120 divisors (see below), whose sum is σ = 102656400. Its totient is φ = 7838208.

The previous prime is 31057007. The next prime is 31057031. The reversal of 31057020 is 2075013.

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 = 31056984 and 31057002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 30276 + ... + 31284.

It is an arithmetic number, because the mean of its divisors is an integer number (855470).

Almost surely, 2^31057020 is an apocalyptic number.

31057020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31057020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51328200).

31057020 is an abundant number, since it is smaller than the sum of its proper divisors (71599380).

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

31057020 is a wasteful number, since it uses less digits than its factorization.

31057020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049 (or 1038 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 31057020 is about 5572.8825575280. The cubic root of 31057020 is about 314.3305510609.

The spelling of 31057020 in words is "thirty-one million, fifty-seven thousand, twenty".