20822389 has 4 divisors (see below), whose sum is σ = 23797024. Its totient is φ = 17847756.

The previous prime is 20822371. The next prime is 20822393. The reversal of 20822389 is 98322802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20822389 - 2²¹ = 18725237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20822089) 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, 1487307 + ... + 1487320.

It is an arithmetic number, because the mean of its divisors is an integer number (5949256).

Almost surely, 2^20822389 is an apocalyptic number.

It is an amenable number.

20822389 is a deficient number, since it is larger than the sum of its proper divisors (2974635).

20822389 is an equidigital number, since it uses as much as digits as its factorization.

20822389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2974634.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20822389 is about 4563.1555967335. The cubic root of 20822389 is about 275.1124124448.

The spelling of 20822389 in words is "twenty million, eight hundred twenty-two thousand, three hundred eighty-nine".