31220403140 has 24 divisors (see below), whose sum is σ = 65929127040. Its totient is φ = 12418393568.

The previous prime is 31220403131. The next prime is 31220403157. The reversal of 31220403140 is 4130402213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4356812 + ... + 4363971.

It is an arithmetic number, because the mean of its divisors is an integer number (2747046960).

Almost surely, 2^31220403140 is an apocalyptic number.

It is an amenable number.

31220403140 is an abundant number, since it is smaller than the sum of its proper divisors (34708723900).

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

31220403140 is a wasteful number, since it uses less digits than its factorization.

31220403140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8720971 (or 8720969 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31220403140 its reverse (4130402213), we get a palindrome (35350805353).

The spelling of 31220403140 in words is "thirty-one billion, two hundred twenty million, four hundred three thousand, one hundred forty".