31620220512 has 48 divisors (see below), whose sum is σ = 83021843520. Its totient is φ = 10537690752.

The previous prime is 31620220501. The next prime is 31620220523. The reversal of 31620220512 is 21502202613.

It is an interprime number because it is at equal distance from previous prime (31620220501) and next prime (31620220523).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 7 ways as a sum of consecutive naturals, for example, 418539 + ... + 488277.

It is an arithmetic number, because the mean of its divisors is an integer number (1729621740).

Almost surely, 2^31620220512 is an apocalyptic number.

31620220512 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31620220512 is an abundant number, since it is smaller than the sum of its proper divisors (51401623008).

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

31620220512 is a wasteful number, since it uses less digits than its factorization.

31620220512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74475 (or 74467 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The spelling of 31620220512 in words is "thirty-one billion, six hundred twenty million, two hundred twenty thousand, five hundred twelve".