20665377 has 12 divisors (see below), whose sum is σ = 29904784. Its totient is φ = 13751640.

The previous prime is 20665367. The next prime is 20665433. The reversal of 20665377 is 77356602.

It is a happy number.

It is not a de Polignac number, because 20665377 - 2⁴ = 20665361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20665357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4002 + ... + 7572.

Almost surely, 2^20665377 is an apocalyptic number.

It is an amenable number.

20665377 is a deficient number, since it is larger than the sum of its proper divisors (9239407).

20665377 is a wasteful number, since it uses less digits than its factorization.

20665377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4220 (or 4217 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 20665377 is about 4545.9187190270. The cubic root of 20665377 is about 274.4191685717.

The spelling of 20665377 in words is "twenty million, six hundred sixty-five thousand, three hundred seventy-seven".