20839225 has 27 divisors (see below), whose sum is σ = 28749679.
Its totient is φ = 14973200.
The previous prime is 20839201. The next prime is 20839243. The reversal of 20839225 is 52293802.
The square root of 20839225 is 4565.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 7502121 + 13337104 = 2739^2 + 3652^2
It is not a de Polignac number, because 20839225 - 27 = 20839097 is a prime.
It is a Duffinian number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 251034 + ... + 251116.
Almost surely, 220839225 is an apocalyptic number.
20839225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
20839225 is the 4565-th square number.
20839225 is the 2283-rd centered octagonal number.
It is an amenable number.
20839225 is a deficient number, since it is larger than the sum of its proper divisors (7910454).
20839225 is an equidigital number, since it uses as much as digits as its factorization.
20839225 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 198 (or 99 counting only the distinct ones).
The product of its (nonzero) digits is 8640, while the sum is 31.
The cubic root of 20839225 is about 275.1865401027.
The spelling of 20839225 in words is "twenty million, eight hundred thirty-nine thousand, two hundred twenty-five".