20180939 has 4 divisors (see below), whose sum is σ = 20196456. Its totient is φ = 20165424.

The previous prime is 20180933. The next prime is 20180971. The reversal of 20180939 is 93908102.

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

It is a cyclic number.

It is not a de Polignac number, because 20180939 - 2¹² = 20176843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20180933) 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 3 ways as a sum of consecutive naturals, for example, 5609 + ... + 8474.

It is an arithmetic number, because the mean of its divisors is an integer number (5049114).

Almost surely, 2^20180939 is an apocalyptic number.

20180939 is a deficient number, since it is larger than the sum of its proper divisors (15517).

20180939 is a wasteful number, since it uses less digits than its factorization.

20180939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15516.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20180939 is about 4492.3200019589. The cubic root of 20180939 is about 272.2578788100.

It can be divided in two parts, 2018093 and 9, that added together give a palindrome (2018102).

The spelling of 20180939 in words is "twenty million, one hundred eighty thousand, nine hundred thirty-nine".