204020001 has 12 divisors (see below), whose sum is σ = 294849828. Its totient is φ = 135942144.

The previous prime is 204019979. The next prime is 204020153. The reversal of 204020001 is 100020402.

It can be written as a sum of positive squares in 2 ways, for example, as 99980001 + 104040000 = 9999^2 + 10200^2 .

It is not a de Polignac number, because 204020001 - 2¹⁰ = 204018977 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (204020501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16801 + ... + 26273.

It is an arithmetic number, because the mean of its divisors is an integer number (24570819).

Almost surely, 2^204020001 is an apocalyptic number.

It is an amenable number.

204020001 is a deficient number, since it is larger than the sum of its proper divisors (90829827).

204020001 is a wasteful number, since it uses less digits than its factorization.

204020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11872 (or 11869 counting only the distinct ones).

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

The square root of 204020001 is about 14283.5570149735. The cubic root of 204020001 is about 588.6957698167.

Adding to 204020001 its reverse (100020402), we get a palindrome (304040403).

The spelling of 204020001 in words is "two hundred four million, twenty thousand, one".