20691927 has 12 divisors (see below), whose sum is σ = 31188144. Its totient is φ = 13194720.

The previous prime is 20691919. The next prime is 20691929. The reversal of 20691927 is 72919602.

It is not a de Polignac number, because 20691927 - 2³ = 20691919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20691891 and 20691900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20691929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49774 + ... + 50187.

It is an arithmetic number, because the mean of its divisors is an integer number (2599012).

Almost surely, 2^20691927 is an apocalyptic number.

20691927 is a deficient number, since it is larger than the sum of its proper divisors (10496217).

20691927 is a wasteful number, since it uses less digits than its factorization.

20691927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99990 (or 99987 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 20691927 is about 4548.8379834855. The cubic root of 20691927 is about 274.5366389825.

The spelling of 20691927 in words is "twenty million, six hundred ninety-one thousand, nine hundred twenty-seven".