20339818 has 4 divisors (see below), whose sum is σ = 30509730. Its totient is φ = 10169908.

The previous prime is 20339807. The next prime is 20339819. The reversal of 20339818 is 81893302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81893302 = 2 ⋅40946651.

It can be written as a sum of positive squares in only one way, i.e., 11854249 + 8485569 = 3443^2 + 2913^2 .

It is not an unprimeable number, because it can be changed into a prime (20339819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5084953 + ... + 5084956.

Almost surely, 2^20339818 is an apocalyptic number.

20339818 is a deficient number, since it is larger than the sum of its proper divisors (10169912).

20339818 is a wasteful number, since it uses less digits than its factorization.

20339818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10169911.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20339818 is about 4509.9687360335. The cubic root of 20339818 is about 272.9704825703.

The spelling of 20339818 in words is "twenty million, three hundred thirty-nine thousand, eight hundred eighteen".