204002100 has 54 divisors (see below), whose sum is σ = 639436070. Its totient is φ = 54400320.

The previous prime is 204002087. The next prime is 204002143. The reversal of 204002100 is 1200402.

It can be written as a sum of positive squares in 3 ways, for example, as 30869136 + 173132964 = 5556^2 + 13158^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 112435 + ... + 114234.

Almost surely, 2^204002100 is an apocalyptic number.

204002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204002100 is an abundant number, since it is smaller than the sum of its proper divisors (435433970).

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

204002100 is a wasteful number, since it uses less digits than its factorization.

204002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226689 (or 226679 counting only the distinct ones).

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

The square root of 204002100 is about 14282.9303716009. The cubic root of 204002100 is about 588.6785516499.

Adding to 204002100 its reverse (1200402), we get a palindrome (205202502).

It can be divided in two parts, 20400 and 2100, that added together give a square (22500 = 150²).

The spelling of 204002100 in words is "two hundred four million, two thousand, one hundred".