204121020 has 48 divisors (see below), whose sum is σ = 582331680. Its totient is φ = 53404416.

The previous prime is 204121007. The next prime is 204121033. The reversal of 204121020 is 20121402.

204121020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (204121007) and next prime (204121033).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 204120987 and 204121005.

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, 28915 + ... + 35274.

It is an arithmetic number, because the mean of its divisors is an integer number (12131910).

Almost surely, 2^204121020 is an apocalyptic number.

204121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204121020 is an abundant number, since it is smaller than the sum of its proper divisors (378210660).

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

204121020 is a wasteful number, since it uses less digits than its factorization.

204121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64254 (or 64252 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 204121020 is about 14287.0927763489. The cubic root of 204121020 is about 588.7929165753.

Adding to 204121020 its reverse (20121402), we get a palindrome (224242422).

The spelling of 204121020 in words is "two hundred four million, one hundred twenty-one thousand, twenty".