20544580 has 48 divisors (see below), whose sum is σ = 49585536. Its totient is φ = 7004160.

The previous prime is 20544571. The next prime is 20544611. The reversal of 20544580 is 8544502.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35695 + ... + 36265.

It is an arithmetic number, because the mean of its divisors is an integer number (1033032).

Almost surely, 2^20544580 is an apocalyptic number.

20544580 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 20544580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24792768).

20544580 is an abundant number, since it is smaller than the sum of its proper divisors (29040956).

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

20544580 is a wasteful number, since it uses less digits than its factorization.

20544580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 20544580 is about 4532.6129329560. The cubic root of 20544580 is about 273.8834284880.

The spelling of 20544580 in words is "twenty million, five hundred forty-four thousand, five hundred eighty".