20939111 has 6 divisors (see below), whose sum is σ = 21396360. Its totient is φ = 20491436.

The previous prime is 20939071. The next prime is 20939123. The reversal of 20939111 is 11193902.

It is not a de Polignac number, because 20939111 - 2²² = 16744807 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 (20933111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2531 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (3566060).

Almost surely, 2^20939111 is an apocalyptic number.

20939111 is a deficient number, since it is larger than the sum of its proper divisors (457249).

20939111 is an frugal number, since it uses more digits than its factorization.

20939111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9573 (or 9526 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 20939111 is about 4575.9273377098. The cubic root of 20939111 is about 275.6255116771.

The spelling of 20939111 in words is "twenty million, nine hundred thirty-nine thousand, one hundred eleven".