20505103239 has 8 divisors (see below), whose sum is σ = 27748199680. Its totient is φ = 13466037816.

The previous prime is 20505103219. The next prime is 20505103243. The reversal of 20505103239 is 93230150502.

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

It is not a de Polignac number, because 20505103239 - 2⁵ = 20505103207 is a prime.

It is a super-2 number, since 2×20505103239² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505103219) 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, 51007519 + ... + 51007920.

It is an arithmetic number, because the mean of its divisors is an integer number (3468524960).

Almost surely, 2^20505103239 is an apocalyptic number.

20505103239 is a deficient number, since it is larger than the sum of its proper divisors (7243096441).

20505103239 is a wasteful number, since it uses less digits than its factorization.

20505103239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102015509.

The product of its (nonzero) digits is 8100, while the sum is 30.

The spelling of 20505103239 in words is "twenty billion, five hundred five million, one hundred three thousand, two hundred thirty-nine".