20083639 has 4 divisors (see below), whose sum is σ = 20119024. Its totient is φ = 20048256.

The previous prime is 20083619. The next prime is 20083649. The reversal of 20083639 is 93638002.

It is a happy number.

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 20083639 - 2⁵ = 20083607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20083639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20083619) 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, 16827 + ... + 17980.

It is an arithmetic number, because the mean of its divisors is an integer number (5029756).

Almost surely, 2^20083639 is an apocalyptic number.

20083639 is a deficient number, since it is larger than the sum of its proper divisors (35385).

20083639 is an equidigital number, since it uses as much as digits as its factorization.

20083639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35384.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20083639 is about 4481.4773233834. The cubic root of 20083639 is about 271.8196207105.

The spelling of 20083639 in words is "twenty million, eighty-three thousand, six hundred thirty-nine".