20774665755 has 40 divisors (see below), whose sum is σ = 38032898112. Its totient is φ = 10844070912.

The previous prime is 20774665741. The next prime is 20774665757. The reversal of 20774665755 is 55756647702.

20774665755 is a `hidden beast` number, since 2 + 0 + 7 + 7 + 4 + 66 + 575 + 5 = 666.

It is not a de Polignac number, because 20774665755 - 2²⁷ = 20640448027 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20774665757) 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 39 ways as a sum of consecutive naturals, for example, 526662 + ... + 564731.

Almost surely, 2^20774665755 is an apocalyptic number.

20774665755 is a deficient number, since it is larger than the sum of its proper divisors (17258232357).

20774665755 is a wasteful number, since it uses less digits than its factorization.

20774665755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091457 (or 1091448 counting only the distinct ones).

The product of its (nonzero) digits is 12348000, while the sum is 54.

The spelling of 20774665755 in words is "twenty billion, seven hundred seventy-four million, six hundred sixty-five thousand, seven hundred fifty-five".