20504520 has 48 divisors (see below), whose sum is σ = 66640860. Its totient is φ = 5467776.

The previous prime is 20504509. The next prime is 20504543. The reversal of 20504520 is 2540502.

It can be written as a sum of positive squares in 2 ways, for example, as 18714276 + 1790244 = 4326^2 + 1338^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20504493 and 20504502.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28119 + ... + 28838.

Almost surely, 2^20504520 is an apocalyptic number.

20504520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20504520 is an abundant number, since it is smaller than the sum of its proper divisors (46136340).

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

20504520 is a wasteful number, since it uses less digits than its factorization.

20504520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56974 (or 56967 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20504520 is about 4528.1916920555. The cubic root of 20504520 is about 273.7052970102.

The spelling of 20504520 in words is "twenty million, five hundred four thousand, five hundred twenty".