20936655 has 12 divisors (see below), whose sum is σ = 36290280. Its totient is φ = 11166192.

The previous prime is 20936581. The next prime is 20936677. The reversal of 20936655 is 55663902.

It is not a de Polignac number, because 20936655 - 2¹³ = 20928463 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232585 + ... + 232674.

It is an arithmetic number, because the mean of its divisors is an integer number (3024190).

Almost surely, 2^20936655 is an apocalyptic number.

20936655 is a deficient number, since it is larger than the sum of its proper divisors (15353625).

20936655 is a wasteful number, since it uses less digits than its factorization.

20936655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465270 (or 465267 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 20936655 is about 4575.6589689355. The cubic root of 20936655 is about 275.6147349903.

It can be divided in two parts, 209 and 36655, that added together give a square (36864 = 192²).

The spelling of 20936655 in words is "twenty million, nine hundred thirty-six thousand, six hundred fifty-five".