20904075 has 84 divisors (see below), whose sum is σ = 41201728. Its totient is φ = 10497600.

The previous prime is 20904043. The next prime is 20904077. The reversal of 20904075 is 57040902.

It is not a de Polignac number, because 20904075 - 2⁵ = 20904043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20904077) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 564957 + ... + 564993.

Almost surely, 2^20904075 is an apocalyptic number.

20904075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20904075 is a deficient number, since it is larger than the sum of its proper divisors (20297653).

20904075 is an equidigital number, since it uses as much as digits as its factorization.

20904075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20904075 is about 4572.0974399065. The cubic root of 20904075 is about 275.4716973394.

Adding to 20904075 its reverse (57040902), we get a palindrome (77944977).

The spelling of 20904075 in words is "twenty million, nine hundred four thousand, seventy-five".