31230200220 has 24 divisors (see below), whose sum is σ = 87444560784. Its totient is φ = 8328053376.

The previous prime is 31230200179. The next prime is 31230200263. The reversal of 31230200220 is 2200203213.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31230200220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260251609 + ... + 260251728.

It is an arithmetic number, because the mean of its divisors is an integer number (3643523366).

Almost surely, 2^31230200220 is an apocalyptic number.

31230200220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31230200220 is an abundant number, since it is smaller than the sum of its proper divisors (56214360564).

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

31230200220 is a wasteful number, since it uses less digits than its factorization.

31230200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520503349 (or 520503347 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 31230200220 its reverse (2200203213), we get a palindrome (33430403433).

The spelling of 31230200220 in words is "thirty-one billion, two hundred thirty million, two hundred thousand, two hundred twenty".