20021994 has 12 divisors (see below), whose sum is σ = 43381026. Its totient is φ = 6673992.

The previous prime is 20021951. The next prime is 20021999. The reversal of 20021994 is 49912002.

It can be written as a sum of positive squares in only one way, i.e., 13068225 + 6953769 = 3615^2 + 2637^2 .

It is not an unprimeable number, because it can be changed into a prime (20021999) 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 5 ways as a sum of consecutive naturals, for example, 556149 + ... + 556184.

Almost surely, 2^20021994 is an apocalyptic number.

20021994 is an abundant number, since it is smaller than the sum of its proper divisors (23359032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021994 is a wasteful number, since it uses less digits than its factorization.

20021994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112341 (or 1112338 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20021994 is about 4474.5942832842. The cubic root of 20021994 is about 271.5412267096.

Adding to 20021994 its reverse (49912002), we get a palindrome (69933996).

The spelling of 20021994 in words is "twenty million, twenty-one thousand, nine hundred ninety-four".