20655261 has 48 divisors (see below), whose sum is σ = 34944000. Its totient is φ = 11625120.

The previous prime is 20655259. The next prime is 20655263. The reversal of 20655261 is 16255602.

20655261 is a `hidden beast` number, since 2 + 0 + 655 + 2 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (20655259) and next prime (20655263).

It is not a de Polignac number, because 20655261 - 2¹ = 20655259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655263) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148530 + ... + 148668.

It is an arithmetic number, because the mean of its divisors is an integer number (728000).

Almost surely, 2^20655261 is an apocalyptic number.

It is an amenable number.

20655261 is a deficient number, since it is larger than the sum of its proper divisors (14288739).

20655261 is a wasteful number, since it uses less digits than its factorization.

20655261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20655261 is about 4544.8059364510. The cubic root of 20655261 is about 274.3743838834.

The spelling of 20655261 in words is "twenty million, six hundred fifty-five thousand, two hundred sixty-one".