20377789 has 2 divisors, whose sum is σ = 20377790. Its totient is φ = 20377788.

The previous prime is 20377783. The next prime is 20377831. The reversal of 20377789 is 98777302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 3485689 = 4110^2 + 1867^2 .

It is a cyclic number.

It is not a de Polignac number, because 20377789 - 2⁷ = 20377661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20377783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10188894 + 10188895.

It is an arithmetic number, because the mean of its divisors is an integer number (10188895).

Almost surely, 2^20377789 is an apocalyptic number.

It is an amenable number.

20377789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20377789 is an equidigital number, since it uses as much as digits as its factorization.

20377789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 20377789 is about 4514.1764475926. The cubic root of 20377789 is about 273.1402402184.

The spelling of 20377789 in words is "twenty million, three hundred seventy-seven thousand, seven hundred eighty-nine".