31020012 has 36 divisors (see below), whose sum is σ = 78951600. Its totient is φ = 10268832.

The previous prime is 31020007. The next prime is 31020079. The reversal of 31020012 is 21002013.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31020012² = 1924482288960288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 31019976 and 31020003.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2473 + ... + 8255.

It is an arithmetic number, because the mean of its divisors is an integer number (2193100).

Almost surely, 2^31020012 is an apocalyptic number.

It is an amenable number.

31020012 is an abundant number, since it is smaller than the sum of its proper divisors (47931588).

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

31020012 is a wasteful number, since it uses less digits than its factorization.

31020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5942 (or 5937 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 31020012 is about 5569.5612035420. The cubic root of 31020012 is about 314.2056478057.

Adding to 31020012 its reverse (21002013), we get a palindrome (52022025).

The spelling of 31020012 in words is "thirty-one million, twenty thousand, twelve".