20045655 has 36 divisors (see below), whose sum is σ = 40423032. Its totient is φ = 9162720.

The previous prime is 20045651. The next prime is 20045681. The reversal of 20045655 is 55654002.

20045655 is a `hidden beast` number, since 2 + 0 + 0 + 4 + 5 + 655 = 666.

It is not a de Polignac number, because 20045655 - 2² = 20045651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045651) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2341 + ... + 6750.

It is an arithmetic number, because the mean of its divisors is an integer number (1122862).

Almost surely, 2^20045655 is an apocalyptic number.

20045655 is an abundant number, since it is smaller than the sum of its proper divisors (20377377).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20045655 is a wasteful number, since it uses less digits than its factorization.

20045655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9116 (or 9106 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 20045655 is about 4477.2374294871. The cubic root of 20045655 is about 271.6481492558.

Adding to 20045655 its reverse (55654002), we get a palindrome (75699657).

The spelling of 20045655 in words is "twenty million, forty-five thousand, six hundred fifty-five".