20898049 has 4 divisors (see below), whose sum is σ = 22127364. Its totient is φ = 19668736.

The previous prime is 20898047. The next prime is 20898091. The reversal of 20898049 is 94089802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7059649 + 13838400 = 2657^2 + 3720^2 .

It is a cyclic number.

It is not a de Polignac number, because 20898049 - 2¹ = 20898047 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20898041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614632 + ... + 614665.

It is an arithmetic number, because the mean of its divisors is an integer number (5531841).

Almost surely, 2^20898049 is an apocalyptic number.

It is an amenable number.

20898049 is a deficient number, since it is larger than the sum of its proper divisors (1229315).

20898049 is a wasteful number, since it uses less digits than its factorization.

20898049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229314.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 20898049 is about 4571.4383950787. The cubic root of 20898049 is about 275.4452247979.

The spelling of 20898049 in words is "twenty million, eight hundred ninety-eight thousand, forty-nine".