20430239 has 8 divisors (see below), whose sum is σ = 21196560. Its totient is φ = 19668096.

The previous prime is 20430191. The next prime is 20430251. The reversal of 20430239 is 93203402.

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 20430239 - 2¹² = 20426143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430439) 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, 11744 + ... + 13370.

It is an arithmetic number, because the mean of its divisors is an integer number (2649570).

Almost surely, 2^20430239 is an apocalyptic number.

20430239 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20430239 is a deficient number, since it is larger than the sum of its proper divisors (766321).

20430239 is a wasteful number, since it uses less digits than its factorization.

20430239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20430239 is about 4519.9821902304. The cubic root of 20430239 is about 273.3743829220.

The spelling of 20430239 in words is "twenty million, four hundred thirty thousand, two hundred thirty-nine".