20189849 has 2 divisors, whose sum is σ = 20189850. Its totient is φ = 20189848.

The previous prime is 20189843. The next prime is 20189857. The reversal of 20189849 is 94898102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18215824 + 1974025 = 4268^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 20189849 - 2⁸ = 20189593 is a prime.

It is not a weakly prime, because it can be changed into another prime (20189843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10094924 + 10094925.

It is an arithmetic number, because the mean of its divisors is an integer number (10094925).

Almost surely, 2^20189849 is an apocalyptic number.

It is an amenable number.

20189849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20189849 is an equidigital number, since it uses as much as digits as its factorization.

20189849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 20189849 is about 4493.3115850117. The cubic root of 20189849 is about 272.2979407183.

The spelling of 20189849 in words is "twenty million, one hundred eighty-nine thousand, eight hundred forty-nine".