20868697 has 4 divisors (see below), whose sum is σ = 21262500. Its totient is φ = 20474896.

The previous prime is 20868671. The next prime is 20868733. The reversal of 20868697 is 79686802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5470921 + 15397776 = 2339^2 + 3924^2 .

It is a cyclic number.

It is not a de Polignac number, because 20868697 - 2¹¹ = 20866649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20868637) 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, 196822 + ... + 196927.

It is an arithmetic number, because the mean of its divisors is an integer number (5315625).

Almost surely, 2^20868697 is an apocalyptic number.

It is an amenable number.

20868697 is a deficient number, since it is larger than the sum of its proper divisors (393803).

20868697 is an equidigital number, since it uses as much as digits as its factorization.

20868697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393802.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 20868697 is about 4568.2268989182. The cubic root of 20868697 is about 275.3162070708.

The spelling of 20868697 in words is "twenty million, eight hundred sixty-eight thousand, six hundred ninety-seven".