20221087 has 2 divisors, whose sum is σ = 20221088. Its totient is φ = 20221086.

The previous prime is 20221079. The next prime is 20221099. The reversal of 20221087 is 78012202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20221087 - 2³ = 20221079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110543 + 10110544.

It is an arithmetic number, because the mean of its divisors is an integer number (10110544).

Almost surely, 2^20221087 is an apocalyptic number.

20221087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221087 is an equidigital number, since it uses as much as digits as its factorization.

20221087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 20221087 is about 4496.7862969014. The cubic root of 20221087 is about 272.4383026720.

Adding to 20221087 its reverse (78012202), we get a palindrome (98233289).

The spelling of 20221087 in words is "twenty million, two hundred twenty-one thousand, eighty-seven".