31032020023220 has 96 divisors (see below), whose sum is σ = 66256939502208. Its totient is φ = 12207425697792.

The previous prime is 31032020023183. The next prime is 31032020023243. The reversal of 31032020023220 is 2232002023013.

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

It is a junction number, because it is equal to n+sod(n) for n = 31032020023192 and 31032020023201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139681067 + ... + 139903053.

It is an arithmetic number, because the mean of its divisors is an integer number (690176453148).

Almost surely, 2^{31032020023220} is an apocalyptic number.

It is an amenable number.

31032020023220 is an abundant number, since it is smaller than the sum of its proper divisors (35224919478988).

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

31032020023220 is a wasteful number, since it uses less digits than its factorization.

31032020023220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222609 (or 222607 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 31032020023220 its reverse (2232002023013), we get a palindrome (33264022046233).

The spelling of 31032020023220 in words is "thirty-one trillion, thirty-two billion, twenty million, twenty-three thousand, two hundred twenty".