20873985 has 32 divisors (see below), whose sum is σ = 36955008. Its totient is φ = 9976320.

The previous prime is 20873959. The next prime is 20873999. The reversal of 20873985 is 58937802.

It is not a de Polignac number, because 20873985 - 2⁵ = 20873953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11179 + ... + 12911.

It is an arithmetic number, because the mean of its divisors is an integer number (1154844).

Almost surely, 2^20873985 is an apocalyptic number.

It is an amenable number.

20873985 is a deficient number, since it is larger than the sum of its proper divisors (16081023).

20873985 is a wasteful number, since it uses less digits than its factorization.

20873985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 20873985 is about 4568.8056426160. The cubic root of 20873985 is about 275.3394595871.

The spelling of 20873985 in words is "twenty million, eight hundred seventy-three thousand, nine hundred eighty-five".