20508825 has 24 divisors (see below), whose sum is σ = 35005696. Its totient is φ = 10584000.

The previous prime is 20508811. The next prime is 20508833. The reversal of 20508825 is 52880502.

It is not a de Polignac number, because 20508825 - 2¹⁰ = 20507801 is a prime.

It is a super-2 number, since 2×20508825² = 841223805761250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20508792 and 20508801.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2086 + ... + 6735.

Almost surely, 2^20508825 is an apocalyptic number.

20508825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20508825 is a deficient number, since it is larger than the sum of its proper divisors (14496871).

20508825 is a wasteful number, since it uses less digits than its factorization.

20508825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8865 (or 8860 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 20508825 is about 4528.6670224250. The cubic root of 20508825 is about 273.7244508171.

The spelling of 20508825 in words is "twenty million, five hundred eight thousand, eight hundred twenty-five".