31986020 has 24 divisors (see below), whose sum is σ = 73277568. Its totient is φ = 11631200.

The previous prime is 31986013. The next prime is 31986029. The reversal of 31986020 is 2068913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31986029) 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, 72476 + ... + 72915.

It is an arithmetic number, because the mean of its divisors is an integer number (3053232).

Almost surely, 2^31986020 is an apocalyptic number.

It is an amenable number.

31986020 is an abundant number, since it is smaller than the sum of its proper divisors (41291548).

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

31986020 is a wasteful number, since it uses less digits than its factorization.

31986020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145411 (or 145409 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 31986020 is about 5655.6184454045. The cubic root of 31986020 is about 317.4339706037.

The spelling of 31986020 in words is "thirty-one million, nine hundred eighty-six thousand, twenty".