31042320220 has 12 divisors (see below), whose sum is σ = 65188872504. Its totient is φ = 12416928080.

The previous prime is 31042320151. The next prime is 31042320247. The reversal of 31042320220 is 2202324013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776057986 + ... + 776058025.

It is an arithmetic number, because the mean of its divisors is an integer number (5432406042).

Almost surely, 2^31042320220 is an apocalyptic number.

It is an amenable number.

31042320220 is an abundant number, since it is smaller than the sum of its proper divisors (34146552284).

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

31042320220 is a wasteful number, since it uses less digits than its factorization.

31042320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552116020 (or 1552116018 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 31042320220 its reverse (2202324013), we get a palindrome (33244644233).

The spelling of 31042320220 in words is "thirty-one billion, forty-two million, three hundred twenty thousand, two hundred twenty".