204021253030420 has 96 divisors (see below), whose sum is σ = 522183893495040. Its totient is φ = 65361793259520.

The previous prime is 204021253030339. The next prime is 204021253030421. The reversal of 204021253030420 is 24030352120402.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204021253030421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 308026071 + ... + 308687710.

It is an arithmetic number, because the mean of its divisors is an integer number (5439415557240).

Almost surely, 2^{204021253030420} is an apocalyptic number.

204021253030420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204021253030420 is an abundant number, since it is smaller than the sum of its proper divisors (318162640464620).

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

204021253030420 is a wasteful number, since it uses less digits than its factorization.

204021253030420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616713953 (or 616713951 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The spelling of 204021253030420 in words is "two hundred four trillion, twenty-one billion, two hundred fifty-three million, thirty thousand, four hundred twenty".