20105625 has 20 divisors (see below), whose sum is σ = 33501776. Its totient is φ = 10722000.

The previous prime is 20105599. The next prime is 20105627. The reversal of 20105625 is 52650102.

It is not a de Polignac number, because 20105625 - 2⁸ = 20105369 is a prime.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20105627) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3487 + ... + 7236.

Almost surely, 2^20105625 is an apocalyptic number.

20105625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20105625 is a deficient number, since it is larger than the sum of its proper divisors (13396151).

20105625 is an equidigital number, since it uses as much as digits as its factorization.

20105625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10746 (or 10731 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20105625 is about 4483.9296381634. The cubic root of 20105625 is about 271.9187735041.

Adding to 20105625 its reverse (52650102), we get a palindrome (72755727).

The spelling of 20105625 in words is "twenty million, one hundred five thousand, six hundred twenty-five".