20021422 has 4 divisors (see below), whose sum is σ = 30032136. Its totient is φ = 10010710.

The previous prime is 20021413. The next prime is 20021429. The reversal of 20021422 is 22412002.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005354 + ... + 5005357.

It is an arithmetic number, because the mean of its divisors is an integer number (7508034).

Almost surely, 2^20021422 is an apocalyptic number.

20021422 is a deficient number, since it is larger than the sum of its proper divisors (10010714).

20021422 is a wasteful number, since it uses less digits than its factorization.

20021422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010713.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20021422 is about 4474.5303664184. The cubic root of 20021422 is about 271.5386408356.

Adding to 20021422 its reverse (22412002), we get a palindrome (42433424).

The spelling of 20021422 in words is "twenty million, twenty-one thousand, four hundred twenty-two".