20889243 has 12 divisors (see below), whose sum is σ = 31948488. Its totient is φ = 13106880.

The previous prime is 20889233. The next prime is 20889269. The reversal of 20889243 is 34298802.

It is not a de Polignac number, because 20889243 - 2⁶ = 20889179 is a prime.

It is a super-2 number, since 2×20889243² = 872720946226098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20889198 and 20889207.

It is not an unprimeable number, because it can be changed into a prime (20889223) 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 in 11 ways as a sum of consecutive naturals, for example, 68113 + ... + 68418.

It is an arithmetic number, because the mean of its divisors is an integer number (2662374).

Almost surely, 2^20889243 is an apocalyptic number.

20889243 is a deficient number, since it is larger than the sum of its proper divisors (11059245).

20889243 is a wasteful number, since it uses less digits than its factorization.

20889243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136554 (or 136551 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20889243 is about 4570.4751394138. The cubic root of 20889243 is about 275.4065304135.

The spelling of 20889243 in words is "twenty million, eight hundred eighty-nine thousand, two hundred forty-three".