31680420 has 48 divisors (see below), whose sum is σ = 88952640. Its totient is φ = 8424576.

The previous prime is 31680403. The next prime is 31680421. The reversal of 31680420 is 2408613.

It is a happy number.

It is a super-2 number, since 2×31680420² = 2007298022752800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31680421) 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, 36714 + ... + 37566.

It is an arithmetic number, because the mean of its divisors is an integer number (1853180).

Almost surely, 2^31680420 is an apocalyptic number.

31680420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31680420 is an abundant number, since it is smaller than the sum of its proper divisors (57272220).

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

31680420 is a wasteful number, since it uses less digits than its factorization.

31680420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484 (or 1482 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 31680420 is about 5628.5362217898. The cubic root of 31680420 is about 316.4197940460.

The spelling of 31680420 in words is "thirty-one million, six hundred eighty thousand, four hundred twenty".