20655425 has 48 divisors (see below), whose sum is σ = 31819392. Its totient is φ = 12979200.

The previous prime is 20655379. The next prime is 20655433. The reversal of 20655425 is 52455602.

It is not a de Polignac number, because 20655425 - 2⁸ = 20655169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157610 + ... + 157740.

It is an arithmetic number, because the mean of its divisors is an integer number (662904).

Almost surely, 2^20655425 is an apocalyptic number.

20655425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20655425 is a deficient number, since it is larger than the sum of its proper divisors (11163967).

20655425 is a wasteful number, since it uses less digits than its factorization.

20655425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 20655425 is about 4544.8239789897. The cubic root of 20655425 is about 274.3751100468.

The spelling of 20655425 in words is "twenty million, six hundred fifty-five thousand, four hundred twenty-five".