20822287 has 2 divisors, whose sum is σ = 20822288. Its totient is φ = 20822286.

The previous prime is 20822281. The next prime is 20822299. The reversal of 20822287 is 78222802.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20822287 - 2³ = 20822279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20822281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10411143 + 10411144.

It is an arithmetic number, because the mean of its divisors is an integer number (10411144).

Almost surely, 2^20822287 is an apocalyptic number.

20822287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20822287 is an equidigital number, since it uses as much as digits as its factorization.

20822287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 20822287 is about 4563.1444202436. The cubic root of 20822287 is about 275.1119632246. Note that the first 3 decimals are identical.

The spelling of 20822287 in words is "twenty million, eight hundred twenty-two thousand, two hundred eighty-seven".