20139727 has 4 divisors (see below), whose sum is σ = 20149120. Its totient is φ = 20130336.

The previous prime is 20139683. The next prime is 20139737. The reversal of 20139727 is 72793102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 72793102 = 2 ⋅36396551.

It is a cyclic number.

It is not a de Polignac number, because 20139727 - 2⁷ = 20139599 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 (20139737) 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, 274 + ... + 6352.

It is an arithmetic number, because the mean of its divisors is an integer number (5037280).

Almost surely, 2^20139727 is an apocalyptic number.

20139727 is a deficient number, since it is larger than the sum of its proper divisors (9393).

20139727 is an equidigital number, since it uses as much as digits as its factorization.

20139727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9392.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20139727 is about 4487.7307183030. The cubic root of 20139727 is about 272.0724243056.

The spelling of 20139727 in words is "twenty million, one hundred thirty-nine thousand, seven hundred twenty-seven".