20398339 has 16 divisors (see below), whose sum is σ = 23123520. Its totient is φ = 17861760.

The previous prime is 20398333. The next prime is 20398387. The reversal of 20398339 is 93389302.

It is a cyclic number.

It is not a de Polignac number, because 20398339 - 2³ = 20398331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20398298 and 20398307.

It is not an unprimeable number, because it can be changed into a prime (20398331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22554 + ... + 23440.

It is an arithmetic number, because the mean of its divisors is an integer number (1445220).

Almost surely, 2^20398339 is an apocalyptic number.

20398339 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20398339 is a deficient number, since it is larger than the sum of its proper divisors (2725181).

20398339 is a wasteful number, since it uses less digits than its factorization.

20398339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 20398339 is about 4516.4520367209. The cubic root of 20398339 is about 273.2320255469.

The spelling of 20398339 in words is "twenty million, three hundred ninety-eight thousand, three hundred thirty-nine".