20134639 has 12 divisors (see below), whose sum is σ = 23775384. Its totient is φ = 16997904.

The previous prime is 20134633. The next prime is 20134643. The reversal of 20134639 is 93643102.

It is not a de Polignac number, because 20134639 - 2¹⁷ = 20003567 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20134633) 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, 217 + ... + 6349.

It is an arithmetic number, because the mean of its divisors is an integer number (1981282).

Almost surely, 2^20134639 is an apocalyptic number.

20134639 is a deficient number, since it is larger than the sum of its proper divisors (3640745).

20134639 is an equidigital number, since it uses as much as digits as its factorization.

20134639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6214 (or 6207 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20134639 is about 4487.1638035623. The cubic root of 20134639 is about 272.0495107033.

The spelling of 20134639 in words is "twenty million, one hundred thirty-four thousand, six hundred thirty-nine".