20368691 has 4 divisors (see below), whose sum is σ = 23278512. Its totient is φ = 17458872.

The previous prime is 20368661. The next prime is 20368723. The reversal of 20368691 is 19686302.

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 20368691 - 2¹⁴ = 20352307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20368651) 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, 1454900 + ... + 1454913.

It is an arithmetic number, because the mean of its divisors is an integer number (5819628).

Almost surely, 2^20368691 is an apocalyptic number.

20368691 is a deficient number, since it is larger than the sum of its proper divisors (2909821).

20368691 is an equidigital number, since it uses as much as digits as its factorization.

20368691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909820.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20368691 is about 4513.1686208251. The cubic root of 20368691 is about 273.0995848456.

The spelling of 20368691 in words is "twenty million, three hundred sixty-eight thousand, six hundred ninety-one".