20541520 has 40 divisors (see below), whose sum is σ = 47950056. Its totient is φ = 8183808.

The previous prime is 20541511. The next prime is 20541523. The reversal of 20541520 is 2514502.

It can be written as a sum of positive squares in 4 ways, for example, as 506944 + 20034576 = 712^2 + 4476^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34344 + ... + 34936.

Almost surely, 2^20541520 is an apocalyptic number.

20541520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20541520 is an abundant number, since it is smaller than the sum of its proper divisors (27408536).

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

20541520 is a wasteful number, since it uses less digits than its factorization.

20541520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20541520 is about 4532.2753667446. The cubic root of 20541520 is about 273.8698300125.

The spelling of 20541520 in words is "twenty million, five hundred forty-one thousand, five hundred twenty".