20485925 has 6 divisors (see below), whose sum is σ = 25402578. Its totient is φ = 16388720.

The previous prime is 20485909. The next prime is 20485943. The reversal of 20485925 is 52958402.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5166529 + 15319396 = 2273^2 + 3914^2 .

It is not a de Polignac number, because 20485925 - 2⁴ = 20485909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409694 + ... + 409743.

It is an arithmetic number, because the mean of its divisors is an integer number (4233763).

Almost surely, 2^20485925 is an apocalyptic number.

20485925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20485925 is a deficient number, since it is larger than the sum of its proper divisors (4916653).

20485925 is an equidigital number, since it uses as much as digits as its factorization.

20485925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819447 (or 819442 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 20485925 is about 4526.1379784536. The cubic root of 20485925 is about 273.6225333188.

The spelling of 20485925 in words is "twenty million, four hundred eighty-five thousand, nine hundred twenty-five".