31120030100020 has 12 divisors (see below), whose sum is σ = 65352063210084. Its totient is φ = 12448012040000.

The previous prime is 31120030099997. The next prime is 31120030100023. The reversal of 31120030100020 is 2000103002113.

It can be written as a sum of positive squares in 2 ways, for example, as 3168528161296 + 27951501938724 = 1780036^2 + 5286918^2 .

It is a super-2 number, since 2×31120030100020² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120030100023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778000752481 + ... + 778000752520.

It is an arithmetic number, because the mean of its divisors is an integer number (5446005267507).

Almost surely, 2^{31120030100020} is an apocalyptic number.

It is an amenable number.

31120030100020 is an abundant number, since it is smaller than the sum of its proper divisors (34232033110064).

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

31120030100020 is a wasteful number, since it uses less digits than its factorization.

31120030100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556001505010 (or 1556001505008 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31120030100020 its reverse (2000103002113), we get a palindrome (33120133102133).

The spelling of 31120030100020 in words is "thirty-one trillion, one hundred twenty billion, thirty million, one hundred thousand, twenty".