20040425 has 6 divisors (see below), whose sum is σ = 24850158. Its totient is φ = 16032320.

The previous prime is 20040409. The next prime is 20040443. The reversal of 20040425 is 52404002.

It can be written as a sum of positive squares in 3 ways, for example, as 609961 + 19430464 = 781^2 + 4408^2 .

It is not a de Polignac number, because 20040425 - 2⁴ = 20040409 is a prime.

It is a Duffinian 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 5 ways as a sum of consecutive naturals, for example, 400784 + ... + 400833.

It is an arithmetic number, because the mean of its divisors is an integer number (4141693).

Almost surely, 2^20040425 is an apocalyptic number.

20040425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20040425 is a deficient number, since it is larger than the sum of its proper divisors (4809733).

20040425 is an equidigital number, since it uses as much as digits as its factorization.

20040425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801627 (or 801622 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20040425 is about 4476.6533258674. The cubic root of 20040425 is about 271.6245224666.

Adding to 20040425 its reverse (52404002), we get a palindrome (72444427).

The spelling of 20040425 in words is "twenty million, forty thousand, four hundred twenty-five".