20100131012 has 12 divisors (see below), whose sum is σ = 37881016236. Its totient is φ = 9276983520.

The previous prime is 20100131003. The next prime is 20100131017. The reversal of 20100131012 is 21013100102.

It can be written as a sum of positive squares in 2 ways, for example, as 2690911876 + 17409219136 = 51874^2 + 131944^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20100130984 and 20100131002.

It is not an unprimeable number, because it can be changed into a prime (20100131017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193270439 + ... + 193270542.

It is an arithmetic number, because the mean of its divisors is an integer number (3156751353).

Almost surely, 2^20100131012 is an apocalyptic number.

It is an amenable number.

20100131012 is a deficient number, since it is larger than the sum of its proper divisors (17780885224).

20100131012 is a wasteful number, since it uses less digits than its factorization.

20100131012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386540998 (or 386540996 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20100131012 its reverse (21013100102), we get a palindrome (41113231114).

The spelling of 20100131012 in words is "twenty billion, one hundred million, one hundred thirty-one thousand, twelve".