20905927 has 4 divisors (see below), whose sum is σ = 23892496. Its totient is φ = 17919360.

The previous prime is 20905921. The next prime is 20905931. The reversal of 20905927 is 72950902.

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 20905927 - 2¹¹ = 20903879 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20905892 and 20905901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20905921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1493274 + ... + 1493287.

It is an arithmetic number, because the mean of its divisors is an integer number (5973124).

Almost surely, 2^20905927 is an apocalyptic number.

20905927 is a deficient number, since it is larger than the sum of its proper divisors (2986569).

20905927 is an equidigital number, since it uses as much as digits as its factorization.

20905927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986568.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 20905927 is about 4572.2999682873. The cubic root of 20905927 is about 275.4798322528.

The spelling of 20905927 in words is "twenty million, nine hundred five thousand, nine hundred twenty-seven".