20853887 has 12 divisors (see below), whose sum is σ = 22393656. Its totient is φ = 19411920.

The previous prime is 20853881. The next prime is 20853913. The reversal of 20853887 is 78835802.

It is not a de Polignac number, because 20853887 - 2⁶ = 20853823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20853881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21548 + ... + 22494.

It is an arithmetic number, because the mean of its divisors is an integer number (1866138).

Almost surely, 2^20853887 is an apocalyptic number.

20853887 is a deficient number, since it is larger than the sum of its proper divisors (1539769).

20853887 is an equidigital number, since it uses as much as digits as its factorization.

20853887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046 (or 1027 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 20853887 is about 4566.6056321955. The cubic root of 20853887 is about 275.2510632822.

The spelling of 20853887 in words is "twenty million, eight hundred fifty-three thousand, eight hundred eighty-seven".