20430836939 has 16 divisors (see below), whose sum is σ = 20806500000. Its totient is φ = 20059280640.

The previous prime is 20430836851. The next prime is 20430836981. The reversal of 20430836939 is 93963803402.

It is a cyclic number.

It is not a de Polignac number, because 20430836939 - 2²⁰ = 20429788363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20430836893 and 20430836902.

It is not an unprimeable number, because it can be changed into a prime (20430836039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8102999 + ... + 8105519.

It is an arithmetic number, because the mean of its divisors is an integer number (1300406250).

Almost surely, 2^20430836939 is an apocalyptic number.

20430836939 is a deficient number, since it is larger than the sum of its proper divisors (375663061).

20430836939 is a wasteful number, since it uses less digits than its factorization.

20430836939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278.

The product of its (nonzero) digits is 839808, while the sum is 47.

The spelling of 20430836939 in words is "twenty billion, four hundred thirty million, eight hundred thirty-six thousand, nine hundred thirty-nine".