31023100220 has 48 divisors (see below), whose sum is σ = 74546185728. Its totient is φ = 10623528000.

The previous prime is 31023100201. The next prime is 31023100223. The reversal of 31023100220 is 2200132013.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 31023100195 and 31023100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023100223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19406 + ... + 249845.

It is an arithmetic number, because the mean of its divisors is an integer number (1553045536).

Almost surely, 2^31023100220 is an apocalyptic number.

It is an amenable number.

31023100220 is an abundant number, since it is smaller than the sum of its proper divisors (43523085508).

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

31023100220 is a wasteful number, since it uses less digits than its factorization.

31023100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270090 (or 270088 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31023100220 its reverse (2200132013), we get a palindrome (33223232233).

The spelling of 31023100220 in words is "thirty-one billion, twenty-three million, one hundred thousand, two hundred twenty".