31331311023220 has 48 divisors (see below), whose sum is σ = 70858636203600. Its totient is φ = 11568211209216.

The previous prime is 31331311023137. The next prime is 31331311023251. The reversal of 31331311023220 is 2232011313313.

It can be written as a sum of positive squares in 8 ways, for example, as 3755642450704 + 27575668572516 = 1937948^2 + 5251254^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9793114 + ... + 12592366.

It is an arithmetic number, because the mean of its divisors is an integer number (1476221587575).

Almost surely, 2^{31331311023220} is an apocalyptic number.

It is an amenable number.

31331311023220 is an abundant number, since it is smaller than the sum of its proper divisors (39527325180380).

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

31331311023220 is a wasteful number, since it uses less digits than its factorization.

31331311023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842324 (or 2842322 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31331311023220 its reverse (2232011313313), we get a palindrome (33563322336533).

The spelling of 31331311023220 in words is "thirty-one trillion, three hundred thirty-one billion, three hundred eleven million, twenty-three thousand, two hundred twenty".