20799911 has 4 divisors (see below), whose sum is σ = 22690824. Its totient is φ = 18909000.

The previous prime is 20799893. The next prime is 20799913. The reversal of 20799911 is 11999702.

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

It is not a de Polignac number, because 20799911 - 2⁶ = 20799847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20799913) 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, 945440 + ... + 945461.

It is an arithmetic number, because the mean of its divisors is an integer number (5672706).

Almost surely, 2^20799911 is an apocalyptic number.

20799911 is a deficient number, since it is larger than the sum of its proper divisors (1890913).

20799911 is a wasteful number, since it uses less digits than its factorization.

20799911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890912.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 20799911 is about 4560.6919431156. The cubic root of 20799911 is about 275.0133811671.

The spelling of 20799911 in words is "twenty million, seven hundred ninety-nine thousand, nine hundred eleven".