31489020 has 48 divisors (see below), whose sum is σ = 97967520. Its totient is φ = 8396928.

The previous prime is 31489009. The next prime is 31489027. The reversal of 31489020 is 2098413.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31489027) 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, 28617 + ... + 29696.

It is an arithmetic number, because the mean of its divisors is an integer number (2040990).

Almost surely, 2^31489020 is an apocalyptic number.

31489020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31489020 is an abundant number, since it is smaller than the sum of its proper divisors (66478500).

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

31489020 is a wasteful number, since it uses less digits than its factorization.

31489020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58331 (or 58323 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 31489020 is about 5611.5078187596. The cubic root of 31489020 is about 315.7812805769.

The spelling of 31489020 in words is "thirty-one million, four hundred eighty-nine thousand, twenty".