20225904 has 40 divisors (see below), whose sum is σ = 52770432. Its totient is φ = 6674880.

The previous prime is 20225897. The next prime is 20225911. The reversal of 20225904 is 40952202.

It is an interprime number because it is at equal distance from previous prime (20225897) and next prime (20225911).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2899 + ... + 6989.

Almost surely, 2^20225904 is an apocalyptic number.

20225904 is a gapful number since it is divisible by the number (24) 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 20225904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26385216).

20225904 is an abundant number, since it is smaller than the sum of its proper divisors (32544528).

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

20225904 is a wasteful number, since it uses less digits than its factorization.

20225904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205 (or 4199 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20225904 is about 4497.3218697354. The cubic root of 20225904 is about 272.4599340695.

It can be divided in two parts, 202 and 25904, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 20225904 in words is "twenty million, two hundred twenty-five thousand, nine hundred four".