31020210020 has 12 divisors (see below), whose sum is σ = 65142441084. Its totient is φ = 12408084000.

The previous prime is 31020209999. The next prime is 31020210041. The reversal of 31020210020 is 2001202013.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31020209999) and next prime (31020210041).

It can be written as a sum of positive squares in 2 ways, for example, as 6251116096 + 24769093924 = 79064^2 + 157382^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31020209983 and 31020210010.

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, 775505231 + ... + 775505270.

It is an arithmetic number, because the mean of its divisors is an integer number (5428536757).

Almost surely, 2^31020210020 is an apocalyptic number.

It is an amenable number.

31020210020 is an abundant number, since it is smaller than the sum of its proper divisors (34122231064).

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

31020210020 is a wasteful number, since it uses less digits than its factorization.

31020210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551010510 (or 1551010508 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 31020210020 its reverse (2001202013), we get a palindrome (33021412033).

The spelling of 31020210020 in words is "thirty-one billion, twenty million, two hundred ten thousand, twenty".