20885849 has 2 divisors, whose sum is σ = 20885850. Its totient is φ = 20885848.

The previous prime is 20885833. The next prime is 20885861. The reversal of 20885849 is 94858802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19642624 + 1243225 = 4432^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 20885849 - 2⁴ = 20885833 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (20885819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10442924 + 10442925.

It is an arithmetic number, because the mean of its divisors is an integer number (10442925).

Almost surely, 2^20885849 is an apocalyptic number.

It is an amenable number.

20885849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20885849 is an equidigital number, since it uses as much as digits as its factorization.

20885849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 20885849 is about 4570.1038281422. The cubic root of 20885849 is about 275.3916139580.

The spelling of 20885849 in words is "twenty million, eight hundred eighty-five thousand, eight hundred forty-nine".