20475904 has 26 divisors (see below), whose sum is σ = 40955000. Its totient is φ = 10235904.

The previous prime is 20475893. The next prime is 20475907. The reversal of 20475904 is 40957402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20475907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1597 + ... + 6595.

Almost surely, 2^20475904 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 20475904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20477500).

20475904 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20475904 is an frugal number, since it uses more digits than its factorization.

20475904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023 (or 5001 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20475904 is about 4525.0308286243. The cubic root of 20475904 is about 273.5779105087.

The spelling of 20475904 in words is "twenty million, four hundred seventy-five thousand, nine hundred four".