20697683 has 4 divisors (see below), whose sum is σ = 20887680. Its totient is φ = 20507688.

The previous prime is 20697659. The next prime is 20697701. The reversal of 20697683 is 38679602.

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 20697683 - 2¹⁶ = 20632147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20697683.

It is not an unprimeable number, because it can be changed into a prime (20697283) 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, 94835 + ... + 95052.

It is an arithmetic number, because the mean of its divisors is an integer number (5221920).

Almost surely, 2^20697683 is an apocalyptic number.

20697683 is a deficient number, since it is larger than the sum of its proper divisors (189997).

20697683 is a wasteful number, since it uses less digits than its factorization.

20697683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189996.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 20697683 is about 4549.4706285457. The cubic root of 20697683 is about 274.5620931349.

The spelling of 20697683 in words is "twenty million, six hundred ninety-seven thousand, six hundred eighty-three".