20139789 has 16 divisors (see below), whose sum is σ = 28422144. Its totient is φ = 12658800.

The previous prime is 20139773. The next prime is 20139793. The reversal of 20139789 is 98793102.

It is not a de Polignac number, because 20139789 - 2⁴ = 20139773 is a prime.

It is a super-2 number, since 2×20139789² = 811222201929042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20139589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2844 + ... + 6954.

It is an arithmetic number, because the mean of its divisors is an integer number (1776384).

Almost surely, 2^20139789 is an apocalyptic number.

It is an amenable number.

20139789 is a deficient number, since it is larger than the sum of its proper divisors (8282355).

20139789 is a wasteful number, since it uses less digits than its factorization.

20139789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 20139789 is about 4487.7376260205. The cubic root of 20139789 is about 272.0727034963.

The spelling of 20139789 in words is "twenty million, one hundred thirty-nine thousand, seven hundred eighty-nine".