20139623 has 8 divisors (see below), whose sum is σ = 23045280. Its totient is φ = 17241120.

The previous prime is 20139619. The next prime is 20139643. The reversal of 20139623 is 32693102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20139623 - 2² = 20139619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20139592 and 20139601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20139643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7433 + ... + 9773.

It is an arithmetic number, because the mean of its divisors is an integer number (2880660).

Almost surely, 2^20139623 is an apocalyptic number.

20139623 is a deficient number, since it is larger than the sum of its proper divisors (2905657).

20139623 is a wasteful number, since it uses less digits than its factorization.

20139623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3577.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 20139623 is about 4487.7191311400. The cubic root of 20139623 is about 272.0719559844.

The spelling of 20139623 in words is "twenty million, one hundred thirty-nine thousand, six hundred twenty-three".