20818825 has 12 divisors (see below), whose sum is σ = 26649088. Its totient is φ = 16117200.

The previous prime is 20818789. The next prime is 20818859. The reversal of 20818825 is 52881802.

It is a happy number.

It is not a de Polignac number, because 20818825 - 2⁹ = 20818313 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12657 + ... + 14206.

Almost surely, 2^20818825 is an apocalyptic number.

20818825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20818825 is a deficient number, since it is larger than the sum of its proper divisors (5830263).

20818825 is a wasteful number, since it uses less digits than its factorization.

20818825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26904 (or 26899 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 20818825 is about 4562.7650607937. The cubic root of 20818825 is about 275.0967152933.

The spelling of 20818825 in words is "twenty million, eight hundred eighteen thousand, eight hundred twenty-five".