204909223560 has 128 divisors (see below), whose sum is σ = 625773772800. Its totient is φ = 53667843840.

The previous prime is 204909223559. The next prime is 204909223573. The reversal of 204909223560 is 65322909402.

It is a Cunningham number, because it is equal to 452669²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1754097 + ... + 1867263.

It is an arithmetic number, because the mean of its divisors is an integer number (4888857600).

Almost surely, 2^204909223560 is an apocalyptic number.

204909223560 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 204909223560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312886886400).

204909223560 is an abundant number, since it is smaller than the sum of its proper divisors (420864549240).

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

204909223560 is a wasteful number, since it uses less digits than its factorization.

204909223560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113451 (or 113447 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 204909223560 in words is "two hundred four billion, nine hundred nine million, two hundred twenty-three thousand, five hundred sixty".