31920486 has 16 divisors (see below), whose sum is σ = 68751984. Its totient is φ = 9821664.

The previous prime is 31920451. The next prime is 31920487. The reversal of 31920486 is 68402913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31920487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204541 + ... + 204696.

It is an arithmetic number, because the mean of its divisors is an integer number (4296999).

Almost surely, 2^31920486 is an apocalyptic number.

31920486 is an abundant number, since it is smaller than the sum of its proper divisors (36831498).

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

31920486 is a wasteful number, since it uses less digits than its factorization.

31920486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409255.

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

The square root of 31920486 is about 5649.8217671003. The cubic root of 31920486 is about 317.2170326923.

The spelling of 31920486 in words is "thirty-one million, nine hundred twenty thousand, four hundred eighty-six".