20765917 has 16 divisors (see below), whose sum is σ = 22739200. Its totient is φ = 18895680.

The previous prime is 20765909. The next prime is 20765923. The reversal of 20765917 is 71956702.

It is a cyclic number.

It is not a de Polignac number, because 20765917 - 2³ = 20765909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20765957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76492 + ... + 76762.

It is an arithmetic number, because the mean of its divisors is an integer number (1421200).

Almost surely, 2^20765917 is an apocalyptic number.

It is an amenable number.

20765917 is a deficient number, since it is larger than the sum of its proper divisors (1973283).

20765917 is a wasteful number, since it uses less digits than its factorization.

20765917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 20765917 is about 4556.9635723802. The cubic root of 20765917 is about 274.8634782415.

The spelling of 20765917 in words is "twenty million, seven hundred sixty-five thousand, nine hundred seventeen".