20903425 has 6 divisors (see below), whose sum is σ = 25920278. Its totient is φ = 16722720.

The previous prime is 20903411. The next prime is 20903437. The reversal of 20903425 is 52430902.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4322241 + 16581184 = 2079^2 + 4072^2 .

It is not a de Polignac number, because 20903425 - 2¹⁹ = 20379137 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: 836137 = 20903425 / (2 + 0 + 9 + 0 + 3 + 4 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20903425.

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 5 ways as a sum of consecutive naturals, for example, 418044 + ... + 418093.

Almost surely, 2^20903425 is an apocalyptic number.

20903425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20903425 is a deficient number, since it is larger than the sum of its proper divisors (5016853).

20903425 is an equidigital number, since it uses as much as digits as its factorization.

20903425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836147 (or 836142 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20903425 is about 4572.0263560045. The cubic root of 20903425 is about 275.4688420993.

The spelling of 20903425 in words is "twenty million, nine hundred three thousand, four hundred twenty-five".