20221984 has 12 divisors (see below), whose sum is σ = 39812094. Its totient is φ = 10110976.

The previous prime is 20221969. The next prime is 20221987. The reversal of 20221984 is 48912202.

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 685584 = 4420^2 + 828^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315937 + ... + 316000.

Almost surely, 2^20221984 is an apocalyptic number.

It is an amenable number.

20221984 is a deficient number, since it is larger than the sum of its proper divisors (19590110).

20221984 is an equidigital number, since it uses as much as digits as its factorization.

20221984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631947 (or 631939 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20221984 is about 4496.8860336904. The cubic root of 20221984 is about 272.4423310335.

It can be divided in two parts, 2022198 and 4, that added together give a palindrome (2022202).

The spelling of 20221984 in words is "twenty million, two hundred twenty-one thousand, nine hundred eighty-four".