20889553 has 2 divisors, whose sum is σ = 20889554. Its totient is φ = 20889552.

The previous prime is 20889551. The next prime is 20889563. The reversal of 20889553 is 35598802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12027024 + 8862529 = 3468^2 + 2977^2 .

It is a cyclic number.

It is not a de Polignac number, because 20889553 - 2¹ = 20889551 is a prime.

Together with 20889551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20889551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10444776 + 10444777.

It is an arithmetic number, because the mean of its divisors is an integer number (10444777).

Almost surely, 2^20889553 is an apocalyptic number.

It is an amenable number.

20889553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20889553 is an equidigital number, since it uses as much as digits as its factorization.

20889553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 20889553 is about 4570.5090526111. The cubic root of 20889553 is about 275.4078927670.

The spelling of 20889553 in words is "twenty million, eight hundred eighty-nine thousand, five hundred fifty-three".