20655855 has 24 divisors (see below), whose sum is σ = 39059280. Its totient is φ = 10014720.

The previous prime is 20655853. The next prime is 20655857. The reversal of 20655855 is 55855602.

It is an interprime number because it is at equal distance from previous prime (20655853) and next prime (20655857).

It is not a de Polignac number, because 20655855 - 2¹ = 20655853 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20370 + ... + 21359.

It is an arithmetic number, because the mean of its divisors is an integer number (1627470).

Almost surely, 2^20655855 is an apocalyptic number.

20655855 is a deficient number, since it is larger than the sum of its proper divisors (18403425).

20655855 is a wasteful number, since it uses less digits than its factorization.

20655855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41751 (or 41748 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The square root of 20655855 is about 4544.8712853061. The cubic root of 20655855 is about 274.3770139934.

The spelling of 20655855 in words is "twenty million, six hundred fifty-five thousand, eight hundred fifty-five".