20889361 has 4 divisors (see below), whose sum is σ = 20898612. Its totient is φ = 20880112.

The previous prime is 20889347. The next prime is 20889373. The reversal of 20889361 is 16398802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19580625 + 1308736 = 4425^2 + 1144^2 .

It is a cyclic number.

It is not a de Polignac number, because 20889361 - 2⁷ = 20889233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20889361.

It is not an unprimeable number, because it can be changed into a prime (20889061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (5224653).

Almost surely, 2^20889361 is an apocalyptic number.

It is an amenable number.

20889361 is a deficient number, since it is larger than the sum of its proper divisors (9251).

20889361 is an equidigital number, since it uses as much as digits as its factorization.

20889361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9250.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 20889361 is about 4570.4880483379. The cubic root of 20889361 is about 275.4070489883.

It can be divided in two parts, 2088 and 9361, that added together give a square (11449 = 107²).

The spelling of 20889361 in words is "twenty million, eight hundred eighty-nine thousand, three hundred sixty-one".