31220123320 has 16 divisors (see below), whose sum is σ = 70245277560. Its totient is φ = 12488049312.

The previous prime is 31220123267. The next prime is 31220123351. The reversal of 31220123320 is 2332102213.

It is a super-2 number, since 2×31220123320² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390251502 + ... + 390251581.

Almost surely, 2^31220123320 is an apocalyptic number.

It is an amenable number.

31220123320 is an abundant number, since it is smaller than the sum of its proper divisors (39025154240).

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

31220123320 is a wasteful number, since it uses less digits than its factorization.

31220123320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780503094 (or 780503090 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31220123320 its reverse (2332102213), we get a palindrome (33552225533).

The spelling of 31220123320 in words is "thirty-one billion, two hundred twenty million, one hundred twenty-three thousand, three hundred twenty".