20421322 has 8 divisors (see below), whose sum is σ = 30653316. Its totient is φ = 10203552.

The previous prime is 20421287. The next prime is 20421329. The reversal of 20421322 is 22312402.

It can be written as a sum of positive squares in 2 ways, for example, as 12809241 + 7612081 = 3579^2 + 2759^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20421296 and 20421305.

It is not an unprimeable number, because it can be changed into a prime (20421329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1438 + ... + 6550.

Almost surely, 2^20421322 is an apocalyptic number.

20421322 is a deficient number, since it is larger than the sum of its proper divisors (10231994).

20421322 is a wasteful number, since it uses less digits than its factorization.

20421322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7112.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20421322 is about 4518.9956848840. The cubic root of 20421322 is about 273.3346047267.

Adding to 20421322 its reverse (22312402), we get a palindrome (42733724).

It can be divided in two parts, 2042 and 1322, that added together give a square (3364 = 58²).

The spelling of 20421322 in words is "twenty million, four hundred twenty-one thousand, three hundred twenty-two".