20873789 has 2 divisors, whose sum is σ = 20873790. Its totient is φ = 20873788.

The previous prime is 20873779. The next prime is 20873803. The reversal of 20873789 is 98737802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19096900 + 1776889 = 4370^2 + 1333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20873789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20873729) 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, 10436894 + 10436895.

It is an arithmetic number, because the mean of its divisors is an integer number (10436895).

Almost surely, 2^20873789 is an apocalyptic number.

It is an amenable number.

20873789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20873789 is an equidigital number, since it uses as much as digits as its factorization.

20873789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 20873789 is about 4568.7841927585. The cubic root of 20873789 is about 275.3385978014.

The spelling of 20873789 in words is "twenty million, eight hundred seventy-three thousand, seven hundred eighty-nine".