20902853 has 6 divisors (see below), whose sum is σ = 21102354. Its totient is φ = 20705216.

The previous prime is 20902813. The next prime is 20902873. The reversal of 20902853 is 35820902.

It can be written as a sum of positive squares in 3 ways, for example, as 5987809 + 14915044 = 2447^2 + 3862^2 .

It is not a de Polignac number, because 20902853 - 2¹⁴ = 20886469 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 (20902813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11951 + ... + 13587.

It is an arithmetic number, because the mean of its divisors is an integer number (3517059).

Almost surely, 2^20902853 is an apocalyptic number.

It is an amenable number.

20902853 is a deficient number, since it is larger than the sum of its proper divisors (199501).

20902853 is an equidigital number, since it uses as much as digits as its factorization.

20902853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863 (or 1750 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20902853 is about 4571.9638012565. The cubic root of 20902853 is about 275.4663294391.

It can be divided in two parts, 20902 and 853, that multiplied together give a triangular number (17829406 = T₅₉₇₁).

The spelling of 20902853 in words is "twenty million, nine hundred two thousand, eight hundred fifty-three".