204129420220 has 96 divisors (see below), whose sum is σ = 473485824000. Its totient is φ = 73306924800.

The previous prime is 204129420197. The next prime is 204129420223. The reversal of 204129420220 is 22024921402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204129420223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5823306 + ... + 5858254.

It is an arithmetic number, because the mean of its divisors is an integer number (4932144000).

Almost surely, 2^204129420220 is an apocalyptic number.

204129420220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204129420220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236742912000).

204129420220 is an abundant number, since it is smaller than the sum of its proper divisors (269356403780).

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

204129420220 is a wasteful number, since it uses less digits than its factorization.

204129420220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35299 (or 35297 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 204129420220 in words is "two hundred four billion, one hundred twenty-nine million, four hundred twenty thousand, two hundred twenty".