20165655 has 32 divisors (see below), whose sum is σ = 35278848. Its totient is φ = 9792000.

The previous prime is 20165647. The next prime is 20165657. The reversal of 20165655 is 55656102.

It is not a de Polignac number, because 20165655 - 2³ = 20165647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6630 + ... + 9180.

It is an arithmetic number, because the mean of its divisors is an integer number (1102464).

Almost surely, 2^20165655 is an apocalyptic number.

20165655 is a deficient number, since it is larger than the sum of its proper divisors (15113193).

20165655 is a wasteful number, since it uses less digits than its factorization.

20165655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2607.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 20165655 is about 4490.6185542751. The cubic root of 20165655 is about 272.1891301036.

It can be divided in two parts, 201 and 65655, that added together give a palindrome (65856).

The spelling of 20165655 in words is "twenty million, one hundred sixty-five thousand, six hundred fifty-five".