20725504 has 36 divisors (see below), whose sum is σ = 43557640. Its totient is φ = 9815040.

The previous prime is 20725501. The next prime is 20725547. The reversal of 20725504 is 40552702.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2734 + ... + 6994.

Almost surely, 2^20725504 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 20725504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21778820).

20725504 is an abundant number, since it is smaller than the sum of its proper divisors (22832136).

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

20725504 is an equidigital number, since it uses as much as digits as its factorization.

20725504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296 (or 4282 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20725504 is about 4552.5272102427. The cubic root of 20725504 is about 274.6850565289.

The spelling of 20725504 in words is "twenty million, seven hundred twenty-five thousand, five hundred four".