100636020 has 72 divisors (see below), whose sum is σ = 316583904. Its totient is φ = 26834976.

The previous prime is 100635991. The next prime is 100636021. The reversal of 100636020 is 20636001.

It is a happy number.

100636020 is a `hidden beast` number, since 1 + 0 + 0 + 63 + 602 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 100635984 and 100636002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100636021) 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, 5494 + ... + 15213.

Almost surely, 2^100636020 is an apocalyptic number.

100636020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100636020 is an abundant number, since it is smaller than the sum of its proper divisors (215947884).

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

100636020 is a wasteful number, since it uses less digits than its factorization.

100636020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20731 (or 20717 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 100636020 is about 10031.7505949859. The cubic root of 100636020 is about 465.1408522316.

The spelling of 100636020 in words is "one hundred million, six hundred thirty-six thousand, twenty".