20655215 has 12 divisors (see below), whose sum is σ = 28833336. Its totient is φ = 14163408.

The previous prime is 20655203. The next prime is 20655227. The reversal of 20655215 is 51255602.

It is an interprime number because it is at equal distance from previous prime (20655203) and next prime (20655227).

It is not a de Polignac number, because 20655215 - 2⁴ = 20655199 is a prime.

It is a congruent number.

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, 41909 + ... + 42398.

It is an arithmetic number, because the mean of its divisors is an integer number (2402778).

Almost surely, 2^20655215 is an apocalyptic number.

20655215 is a deficient number, since it is larger than the sum of its proper divisors (8178121).

20655215 is an equidigital number, since it uses as much as digits as its factorization.

20655215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84326 (or 84319 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 20655215 is about 4544.8008757260. The cubic root of 20655215 is about 274.3741802028.

The spelling of 20655215 in words is "twenty million, six hundred fifty-five thousand, two hundred fifteen".