20443109 has 2 divisors, whose sum is σ = 20443110. Its totient is φ = 20443108.

The previous prime is 20443097. The next prime is 20443123. The reversal of 20443109 is 90134402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20052484 + 390625 = 4478^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443109 - 2⁸ = 20442853 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 (20443009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221554 + 10221555.

It is an arithmetic number, because the mean of its divisors is an integer number (10221555).

Almost surely, 2^20443109 is an apocalyptic number.

It is an amenable number.

20443109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443109 is an equidigital number, since it uses as much as digits as its factorization.

20443109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20443109 is about 4521.4056442660. The cubic root of 20443109 is about 273.4317748069.

The spelling of 20443109 in words is "twenty million, four hundred forty-three thousand, one hundred nine".