20009925 has 36 divisors (see below), whose sum is σ = 38602564. Its totient is φ = 9849600.

The previous prime is 20009923. The next prime is 20009929. The reversal of 20009925 is 52990002.

It can be written as a sum of positive squares in 6 ways, for example, as 799236 + 19210689 = 894^2 + 4383^2 .

It is not a de Polignac number, because 20009925 - 2¹ = 20009923 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20009923) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 496 + ... + 6345.

Almost surely, 2^20009925 is an apocalyptic number.

20009925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20009925 is a deficient number, since it is larger than the sum of its proper divisors (18592639).

20009925 is a wasteful number, since it uses less digits than its factorization.

20009925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6870 (or 6862 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20009925 is about 4473.2454661018. The cubic root of 20009925 is about 271.4866552256.

Adding to 20009925 its reverse (52990002), we get a palindrome (72999927).

The spelling of 20009925 in words is "twenty million, nine thousand, nine hundred twenty-five".