20822391 has 6 divisors (see below), whose sum is σ = 30076800. Its totient is φ = 13881588.

The previous prime is 20822371. The next prime is 20822393. The reversal of 20822391 is 19322802.

It is a happy number.

It is not a de Polignac number, because 20822391 - 2¹⁸ = 20560247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20822393) 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 5 ways as a sum of consecutive naturals, for example, 1156791 + ... + 1156808.

It is an arithmetic number, because the mean of its divisors is an integer number (5012800).

Almost surely, 2^20822391 is an apocalyptic number.

20822391 is a deficient number, since it is larger than the sum of its proper divisors (9254409).

20822391 is a wasteful number, since it uses less digits than its factorization.

20822391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313605 (or 2313602 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20822391 is about 4563.1558158801. The cubic root of 20822391 is about 275.1124212530.

The spelling of 20822391 in words is "twenty million, eight hundred twenty-two thousand, three hundred ninety-one".