31020020 has 12 divisors (see below), whose sum is σ = 65142084. Its totient is φ = 12408000.

The previous prime is 31020007. The next prime is 31020079. The reversal of 31020020 is 2002013.

31020020 = T₃₅₂₀ + T₃₅₂₁ + ... + T₃₅₂₄.

It can be written as a sum of positive squares in 2 ways, for example, as 4104676 + 26915344 = 2026^2 + 5188^2 .

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, 775481 + ... + 775520.

It is an arithmetic number, because the mean of its divisors is an integer number (5428507).

Almost surely, 2^31020020 is an apocalyptic number.

It is an amenable number.

31020020 is an abundant number, since it is smaller than the sum of its proper divisors (34122064).

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

31020020 is a wasteful number, since it uses less digits than its factorization.

31020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551010 (or 1551008 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 31020020 is about 5569.5619217314. The cubic root of 31020020 is about 314.2056748167.

Adding to 31020020 its reverse (2002013), we get a palindrome (33022033).

The spelling of 31020020 in words is "thirty-one million, twenty thousand, twenty".