20205025 has 27 divisors (see below), whose sum is σ = 26811993.
Its totient is φ = 15103200.
The previous prime is 20205023. The next prime is 20205041. The reversal of 20205025 is 52050202.
The square root of 20205025 is 4495.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in 4 ways, for example, as 277729 + 19927296 = 527^2 + 4464^2
It is not a de Polignac number, because 20205025 - 21 = 20205023 is a prime.
It is not an unprimeable number, because it can be changed into a prime (20205023) by changing a digit.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 651760 + ... + 651790.
Almost surely, 220205025 is an apocalyptic number.
20205025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
20205025 is the 4495-th square number.
20205025 is the 2248-th centered octagonal number.
It is an amenable number.
20205025 is a deficient number, since it is larger than the sum of its proper divisors (6606968).
20205025 is an equidigital number, since it uses as much as digits as its factorization.
20205025 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 130 (or 65 counting only the distinct ones).
The product of its (nonzero) digits is 200, while the sum is 16.
The cubic root of 20205025 is about 272.3661492289.
Multiplying 20205025 by its sum of digits (16), we get a square (323280400 = 179802).
Adding to 20205025 its reverse (52050202), we get a palindrome (72255227).
The spelling of 20205025 in words is "twenty million, two hundred five thousand, twenty-five".