31204222020 has 36 divisors (see below), whose sum is σ = 94652807340. Its totient is φ = 8321125824.

The previous prime is 31204222013. The next prime is 31204222033. The reversal of 31204222020 is 2022240213.

It can be written as a sum of positive squares in 2 ways, for example, as 16727800896 + 14476421124 = 129336^2 + 120318^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31204221984 and 31204222002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86678215 + ... + 86678574.

Almost surely, 2^31204222020 is an apocalyptic number.

31204222020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31204222020 is an abundant number, since it is smaller than the sum of its proper divisors (63448585320).

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

31204222020 is a wasteful number, since it uses less digits than its factorization.

31204222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173356804 (or 173356799 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 31204222020 its reverse (2022240213), we get a palindrome (33226462233).

The spelling of 31204222020 in words is "thirty-one billion, two hundred four million, two hundred twenty-two thousand, twenty".