131002000020 has 72 divisors (see below), whose sum is σ = 406613983776. Its totient is φ = 34121449152.

The previous prime is 131001999991. The next prime is 131002000021. The reversal of 131002000020 is 20000200131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 131001999966 and 131002000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131002000021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8454922 + ... + 8470401.

Almost surely, 2^131002000020 is an apocalyptic number.

131002000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131002000020 is an abundant number, since it is smaller than the sum of its proper divisors (275611983756).

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

131002000020 is a wasteful number, since it uses less digits than its factorization.

131002000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16925381 (or 16925376 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 131002000020 its reverse (20000200131), we get a palindrome (151002200151).

The spelling of 131002000020 in words is "one hundred thirty-one billion, two million, twenty", and thus it is an aban number.