31020130020 has 96 divisors (see below), whose sum is σ = 94846381056. Its totient is φ = 7512572800.

The previous prime is 31020130019. The next prime is 31020130051. The reversal of 31020130020 is 2003102013.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31020129978 and 31020130005.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 657667 + ... + 703253.

It is an arithmetic number, because the mean of its divisors is an integer number (987983136).

Almost surely, 2^31020130020 is an apocalyptic number.

31020130020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31020130020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47423190528).

31020130020 is an abundant number, since it is smaller than the sum of its proper divisors (63826251036).

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

31020130020 is a wasteful number, since it uses less digits than its factorization.

31020130020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46641 (or 46639 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 31020130020 its reverse (2003102013), we get a palindrome (33023232033).

The spelling of 31020130020 in words is "thirty-one billion, twenty million, one hundred thirty thousand, twenty".