20993825 has 24 divisors (see below), whose sum is σ = 28123200. Its totient is φ = 15498560.

The previous prime is 20993813. The next prime is 20993831. The reversal of 20993825 is 52839902.

It is not a de Polignac number, because 20993825 - 2¹⁴ = 20977441 is a prime.

It is a hoax number, since the sum of its digits (38) 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 23 ways as a sum of consecutive naturals, for example, 16046 + ... + 17304.

It is an arithmetic number, because the mean of its divisors is an integer number (1171800).

Almost surely, 2^20993825 is an apocalyptic number.

20993825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20993825 is a deficient number, since it is larger than the sum of its proper divisors (7129375).

20993825 is a wasteful number, since it uses less digits than its factorization.

20993825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321 (or 1316 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 20993825 is about 4581.9018976840. The cubic root of 20993825 is about 275.8653731510.

The spelling of 20993825 in words is "twenty million, nine hundred ninety-three thousand, eight hundred twenty-five".