31201100020 has 24 divisors (see below), whose sum is σ = 66500257824. Its totient is φ = 12294164256.

The previous prime is 31201099987. The next prime is 31201100057. The reversal of 31201100020 is 2000110213.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11640862 + ... + 11643541.

It is an arithmetic number, because the mean of its divisors is an integer number (2770844076).

Almost surely, 2^31201100020 is an apocalyptic number.

It is an amenable number.

31201100020 is an abundant number, since it is smaller than the sum of its proper divisors (35299157804).

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

31201100020 is a wasteful number, since it uses less digits than its factorization.

31201100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23284479 (or 23284477 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 31201100020 its reverse (2000110213), we get a palindrome (33201210233).

The spelling of 31201100020 in words is "thirty-one billion, two hundred one million, one hundred thousand, twenty".