20775967 has 4 divisors (see below), whose sum is σ = 20908456. Its totient is φ = 20643480.

The previous prime is 20775961. The next prime is 20775991. The reversal of 20775967 is 76957702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20775967 - 2³ = 20775959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66009 + ... + 66322.

It is an arithmetic number, because the mean of its divisors is an integer number (5227114).

Almost surely, 2^20775967 is an apocalyptic number.

20775967 is a deficient number, since it is larger than the sum of its proper divisors (132489).

20775967 is a wasteful number, since it uses less digits than its factorization.

20775967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132488.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 20775967 is about 4558.0661469531. The cubic root of 20775967 is about 274.9078126259.

The spelling of 20775967 in words is "twenty million, seven hundred seventy-five thousand, nine hundred sixty-seven".