20118839 has 4 divisors (see below), whose sum is σ = 21666456. Its totient is φ = 18571224.

The previous prime is 20118811. The next prime is 20118841. The reversal of 20118839 is 93881102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20118839 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 (20118809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773789 + ... + 773814.

It is an arithmetic number, because the mean of its divisors is an integer number (5416614).

Almost surely, 2^20118839 is an apocalyptic number.

20118839 is a deficient number, since it is larger than the sum of its proper divisors (1547617).

20118839 is a wasteful number, since it uses less digits than its factorization.

20118839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547616.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 20118839 is about 4485.4028804557. The cubic root of 20118839 is about 271.9783314270.

The spelling of 20118839 in words is "twenty million, one hundred eighteen thousand, eight hundred thirty-nine".