20790665 has 16 divisors (see below), whose sum is σ = 28691712. Its totient is φ = 14167104.

The previous prime is 20790613. The next prime is 20790683. The reversal of 20790665 is 56609702.

It is not a de Polignac number, because 20790665 - 2⁸ = 20790409 is a prime.

It is a super-2 number, since 2×20790665² = 864503502284450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4067 + ... + 7623.

It is an arithmetic number, because the mean of its divisors is an integer number (1793232).

Almost surely, 2^20790665 is an apocalyptic number.

It is an amenable number.

20790665 is a deficient number, since it is larger than the sum of its proper divisors (7901047).

20790665 is a wasteful number, since it uses less digits than its factorization.

20790665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 20790665 is about 4559.6781684676. The cubic root of 20790665 is about 274.9726253743.

The spelling of 20790665 in words is "twenty million, seven hundred ninety thousand, six hundred sixty-five".