20725225 has 12 divisors (see below), whose sum is σ = 26136720. Its totient is φ = 16298000.

The previous prime is 20725171. The next prime is 20725241. The reversal of 20725225 is 52252702.

It is not a de Polignac number, because 20725225 - 2¹⁹ = 20200937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 20725225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5551 + ... + 8500.

It is an arithmetic number, because the mean of its divisors is an integer number (2178060).

Almost surely, 2^20725225 is an apocalyptic number.

20725225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20725225 is a deficient number, since it is larger than the sum of its proper divisors (5411495).

20725225 is a wasteful number, since it uses less digits than its factorization.

20725225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14120 (or 14115 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20725225 is about 4552.4965678186. The cubic root of 20725225 is about 274.6838239497.

Adding to 20725225 its reverse (52252702), we get a palindrome (72977927).

The spelling of 20725225 in words is "twenty million, seven hundred twenty-five thousand, two hundred twenty-five".