31486920 has 32 divisors (see below), whose sum is σ = 94461120. Its totient is φ = 8396480.

The previous prime is 31486859. The next prime is 31486927. The reversal of 31486920 is 2968413.

It is a super-2 number, since 2×31486920² = 1982852262172800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31486927) 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, 131076 + ... + 131315.

It is an arithmetic number, because the mean of its divisors is an integer number (2951910).

Almost surely, 2^31486920 is an apocalyptic number.

31486920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31486920 is an abundant number, since it is smaller than the sum of its proper divisors (62974200).

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

31486920 is a wasteful number, since it uses less digits than its factorization.

31486920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262405 (or 262401 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 31486920 is about 5611.3207001561. The cubic root of 31486920 is about 315.7742606122.

The spelling of 31486920 in words is "thirty-one million, four hundred eighty-six thousand, nine hundred twenty".