20839173 has 16 divisors (see below), whose sum is σ = 29368320. Its totient is φ = 13117104.

The previous prime is 20839157. The next prime is 20839187. The reversal of 20839173 is 37193802.

It is not a de Polignac number, because 20839173 - 2⁴ = 20839157 is a prime.

It is a super-2 number, since 2×20839173² = 868542262647858, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20839373) 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, 3540 + ... + 7362.

It is an arithmetic number, because the mean of its divisors is an integer number (1835520).

Almost surely, 2^20839173 is an apocalyptic number.

20839173 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20839173 is a deficient number, since it is larger than the sum of its proper divisors (8529147).

20839173 is a wasteful number, since it uses less digits than its factorization.

20839173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3928.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20839173 is about 4564.9943044871. The cubic root of 20839173 is about 275.1863112121.

It can be divided in two parts, 20839 and 173, that added together give a palindrome (21012).

The spelling of 20839173 in words is "twenty million, eight hundred thirty-nine thousand, one hundred seventy-three".