31020123320 has 16 divisors (see below), whose sum is σ = 69795277560. Its totient is φ = 12408049312.

The previous prime is 31020123301. The next prime is 31020123347. The reversal of 31020123320 is 2332102013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387751502 + ... + 387751581.

Almost surely, 2^31020123320 is an apocalyptic number.

It is an amenable number.

31020123320 is an abundant number, since it is smaller than the sum of its proper divisors (38775154240).

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

31020123320 is a wasteful number, since it uses less digits than its factorization.

31020123320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775503094 (or 775503090 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31020123320 its reverse (2332102013), we get a palindrome (33352225333).

The spelling of 31020123320 in words is "thirty-one billion, twenty million, one hundred twenty-three thousand, three hundred twenty".