31920102420 has 48 divisors (see below), whose sum is σ = 93262216320. Its totient is φ = 8141938816.

The previous prime is 31920102419. The next prime is 31920102439. The reversal of 31920102420 is 2420102913.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11563875 + ... + 11566634.

It is an arithmetic number, because the mean of its divisors is an integer number (1942962840).

Almost surely, 2^31920102420 is an apocalyptic number.

31920102420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31920102420 is an abundant number, since it is smaller than the sum of its proper divisors (61342113900).

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

31920102420 is a wasteful number, since it uses less digits than its factorization.

31920102420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23130544 (or 23130542 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The spelling of 31920102420 in words is "thirty-one billion, nine hundred twenty million, one hundred two thousand, four hundred twenty".