636345100020 has 96 divisors (see below), whose sum is σ = 2066697013248. Its totient is φ = 143279402112.

The previous prime is 636345099989. The next prime is 636345100037. The reversal of 636345100020 is 20001543636.

636345100020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 11278632 + ... + 11334911.

It is an arithmetic number, because the mean of its divisors is an integer number (21528093888).

Almost surely, 2^636345100020 is an apocalyptic number.

636345100020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

636345100020 is an abundant number, since it is smaller than the sum of its proper divisors (1430351913228).

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

636345100020 is a wasteful number, since it uses less digits than its factorization.

636345100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22613629 (or 22613627 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

Adding to 636345100020 its reverse (20001543636), we get a palindrome (656346643656).

The spelling of 636345100020 in words is "six hundred thirty-six billion, three hundred forty-five million, one hundred thousand, twenty".