204161520 has 40 divisors (see below), whose sum is σ = 632901456. Its totient is φ = 54443008.

The previous prime is 204161473. The next prime is 204161539. The reversal of 204161520 is 25161402.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425097 + ... + 425576.

Almost surely, 2^204161520 is an apocalyptic number.

204161520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204161520 is an abundant number, since it is smaller than the sum of its proper divisors (428739936).

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

204161520 is a wasteful number, since it uses less digits than its factorization.

204161520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850689 (or 850683 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 204161520 is about 14288.5100692829. The cubic root of 204161520 is about 588.8318551360.

The spelling of 204161520 in words is "two hundred four million, one hundred sixty-one thousand, five hundred twenty".