31233020220 has 36 divisors (see below), whose sum is σ = 94740161880. Its totient is φ = 8328805344.

The previous prime is 31233020167. The next prime is 31233020261. The reversal of 31233020220 is 2202033213.

It is a happy number.

31233020220 is a `hidden beast` number, since 312 + 330 + 2 + 0 + 2 + 20 = 666.

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 = 31233020193 and 31233020202.

It is a congruent number.

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, 86758210 + ... + 86758569.

Almost surely, 2^31233020220 is an apocalyptic number.

31233020220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31233020220 is an abundant number, since it is smaller than the sum of its proper divisors (63507141660).

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

31233020220 is a wasteful number, since it uses less digits than its factorization.

31233020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173516794 (or 173516789 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 31233020220 its reverse (2202033213), we get a palindrome (33435053433).

The spelling of 31233020220 in words is "thirty-one billion, two hundred thirty-three million, twenty thousand, two hundred twenty".