20859825 has 24 divisors (see below), whose sum is σ = 39416128. Its totient is φ = 9535680.

The previous prime is 20859737. The next prime is 20859841. The reversal of 20859825 is 52895802.

20859825 = 1068² + 1069² + ... + 1085².

It is not a de Polignac number, because 20859825 - 2¹¹ = 20857777 is a prime.

It is a Duffinian number.

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, 19342 + ... + 20391.

Almost surely, 2^20859825 is an apocalyptic number.

20859825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20859825 is a deficient number, since it is larger than the sum of its proper divisors (18556303).

20859825 is a wasteful number, since it uses less digits than its factorization.

20859825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39753 (or 39748 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 20859825 is about 4567.2557405952. The cubic root of 20859825 is about 275.2771860813.

The spelling of 20859825 in words is "twenty million, eight hundred fifty-nine thousand, eight hundred twenty-five".