20018849 has 2 divisors, whose sum is σ = 20018850. Its totient is φ = 20018848.

The previous prime is 20018833. The next prime is 20018881. The reversal of 20018849 is 94881002.

It is a happy number.

It is an a-pointer prime, because the next prime (20018881) can be obtained adding 20018849 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15460624 + 4558225 = 3932^2 + 2135^2 .

It is a cyclic number.

It is not a de Polignac number, because 20018849 - 2⁴ = 20018833 is a prime.

It is not a weakly prime, because it can be changed into another prime (20018819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009424 + 10009425.

It is an arithmetic number, because the mean of its divisors is an integer number (10009425).

Almost surely, 2^20018849 is an apocalyptic number.

It is an amenable number.

20018849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20018849 is an equidigital number, since it uses as much as digits as its factorization.

20018849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20018849 is about 4474.2428409732. The cubic root of 20018849 is about 271.5270083143.

The spelling of 20018849 in words is "twenty million, eighteen thousand, eight hundred forty-nine".