31020120340 has 48 divisors (see below), whose sum is σ = 71716296960. Its totient is φ = 11176548480.

The previous prime is 31020120319. The next prime is 31020120349. The reversal of 31020120340 is 4302102013.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020120349) 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, 622812 + ... + 670771.

It is an arithmetic number, because the mean of its divisors is an integer number (1494089520).

Almost surely, 2^31020120340 is an apocalyptic number.

It is an amenable number.

31020120340 is an abundant number, since it is smaller than the sum of its proper divisors (40696176620).

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

31020120340 is a wasteful number, since it uses less digits than its factorization.

31020120340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293712 (or 1293710 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31020120340 its reverse (4302102013), we get a palindrome (35322222353).

The spelling of 31020120340 in words is "thirty-one billion, twenty million, one hundred twenty thousand, three hundred forty".