20655225 has 18 divisors (see below), whose sum is σ = 36996206. Its totient is φ = 11016000.

The previous prime is 20655203. The next prime is 20655227. The reversal of 20655225 is 52255602.

20655225 is a `hidden beast` number, since 2 + 0 + 655 + 2 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 968256 + 19686969 = 984^2 + 4437^2 .

It is not a de Polignac number, because 20655225 - 2⁶ = 20655161 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20655227) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45676 + ... + 46125.

Almost surely, 2^20655225 is an apocalyptic number.

20655225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20655225 is a deficient number, since it is larger than the sum of its proper divisors (16340981).

20655225 is a wasteful number, since it uses less digits than its factorization.

20655225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91817 (or 91809 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 20655225 is about 4544.8019758841. The cubic root of 20655225 is about 274.3742244812.

The spelling of 20655225 in words is "twenty million, six hundred fifty-five thousand, two hundred twenty-five".