20008725 has 48 divisors (see below), whose sum is σ = 36664320. Its totient is φ = 9547200.

The previous prime is 20008721. The next prime is 20008759. The reversal of 20008725 is 52780002.

It is not a de Polignac number, because 20008725 - 2² = 20008721 is a prime.

It is a super-2 number, since 2×20008725² = 800698152251250, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20008695 and 20008704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20008721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65022 + ... + 65328.

It is an arithmetic number, because the mean of its divisors is an integer number (763840).

Almost surely, 2^20008725 is an apocalyptic number.

20008725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20008725 is a deficient number, since it is larger than the sum of its proper divisors (16655595).

20008725 is a wasteful number, since it uses less digits than its factorization.

20008725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 20008725 is about 4473.1113332892. Note that the first 3 decimals coincide. The cubic root of 20008725 is about 271.4812280771.

Adding to 20008725 its reverse (52780002), we get a palindrome (72788727).

The spelling of 20008725 in words is "twenty million, eight thousand, seven hundred twenty-five".