20604544 has 48 divisors (see below), whose sum is σ = 43683030. Its totient is φ = 9678848.

The previous prime is 20604541. The next prime is 20604547. The reversal of 20604544 is 44540602.

It is an interprime number because it is at equal distance from previous prime (20604541) and next prime (20604547).

It can be written as a sum of positive squares in 3 ways, for example, as 18318400 + 2286144 = 4280^2 + 1512^2 .

It is not an unprimeable number, because it can be changed into a prime (20604541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36714 + ... + 37270.

Almost surely, 2^20604544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20604544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21841515).

20604544 is an abundant number, since it is smaller than the sum of its proper divisors (23078486).

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

20604544 is an equidigital number, since it uses as much as digits as its factorization.

20604544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 20604544 is about 4539.2228409718. Note that the first 3 decimals coincide. The cubic root of 20604544 is about 274.1496332249.

The spelling of 20604544 in words is "twenty million, six hundred four thousand, five hundred forty-four".