20573984 has 12 divisors (see below), whose sum is σ = 40505094. Its totient is φ = 10286976.

The previous prime is 20573981. The next prime is 20573989. The reversal of 20573984 is 48937502.

It can be written as a sum of positive squares in only one way, i.e., 17405584 + 3168400 = 4172^2 + 1780^2 .

It is not an unprimeable number, because it can be changed into a prime (20573981) 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, 321437 + ... + 321500.

Almost surely, 2^20573984 is an apocalyptic number.

It is an amenable number.

20573984 is a deficient number, since it is larger than the sum of its proper divisors (19931110).

20573984 is an equidigital number, since it uses as much as digits as its factorization.

20573984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642947 (or 642939 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20573984 is about 4535.8553768832. The cubic root of 20573984 is about 274.0140295088.

The spelling of 20573984 in words is "twenty million, five hundred seventy-three thousand, nine hundred eighty-four".