204100020 has 48 divisors (see below), whose sum is σ = 634979520. Its totient is φ = 54426528.

The previous prime is 204100019. The next prime is 204100031. The reversal of 204100020 is 20001402.

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 = 204099975 and 204100011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188442 + ... + 189521.

It is an arithmetic number, because the mean of its divisors is an integer number (13228740).

Almost surely, 2^204100020 is an apocalyptic number.

204100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204100020 is an abundant number, since it is smaller than the sum of its proper divisors (430879500).

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

204100020 is a wasteful number, since it uses less digits than its factorization.

204100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377981 (or 377973 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 204100020 is about 14286.3578283620. The cubic root of 204100020 is about 588.7727241827.

Adding to 204100020 its reverse (20001402), we get a palindrome (224101422).

The spelling of 204100020 in words is "two hundred four million, one hundred thousand, twenty".