20504560 has 20 divisors (see below), whose sum is σ = 47673288. Its totient is φ = 8201792.

The previous prime is 20504557. The next prime is 20504573. The reversal of 20504560 is 6540502.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128074 + ... + 128233.

Almost surely, 2^20504560 is an apocalyptic number.

20504560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20504560 is an abundant number, since it is smaller than the sum of its proper divisors (27168728).

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

20504560 is a wasteful number, since it uses less digits than its factorization.

20504560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256320 (or 256314 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20504560 is about 4528.1961088274. The cubic root of 20504560 is about 273.7054749906.

The spelling of 20504560 in words is "twenty million, five hundred four thousand, five hundred sixty".