20475025 has 6 divisors (see below), whose sum is σ = 25389062. Its totient is φ = 16380000.

The previous prime is 20475019. The next prime is 20475041. The reversal of 20475025 is 52057402.

It can be written as a sum of positive squares in 3 ways, for example, as 1535121 + 18939904 = 1239^2 + 4352^2 .

It is not a de Polignac number, because 20475025 - 2⁷ = 20474897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 819001 = 20475025 / (2 + 0 + 4 + 7 + 5 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 409476 + ... + 409525.

Almost surely, 2^20475025 is an apocalyptic number.

20475025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20475025 is a deficient number, since it is larger than the sum of its proper divisors (4914037).

20475025 is an equidigital number, since it uses as much as digits as its factorization.

20475025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819011 (or 819006 counting only the distinct ones).

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

The square root of 20475025 is about 4524.9337011718. The cubic root of 20475025 is about 273.5739956889.

The spelling of 20475025 in words is "twenty million, four hundred seventy-five thousand, twenty-five".