20221447 has 4 divisors (see below), whose sum is σ = 20230696. Its totient is φ = 20212200.

The previous prime is 20221441. The next prime is 20221457. The reversal of 20221447 is 74412202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20221447 - 2⁷ = 20221319 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 (20221441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697 + ... + 6397.

It is an arithmetic number, because the mean of its divisors is an integer number (5057674).

Almost surely, 2^20221447 is an apocalyptic number.

20221447 is a deficient number, since it is larger than the sum of its proper divisors (9249).

20221447 is an equidigital number, since it uses as much as digits as its factorization.

20221447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 20221447 is about 4496.8263253099. The cubic root of 20221447 is about 272.4399194201.

Adding to 20221447 its reverse (74412202), we get a palindrome (94633649).

The spelling of 20221447 in words is "twenty million, two hundred twenty-one thousand, four hundred forty-seven".