20421202 has 4 divisors (see below), whose sum is σ = 30631806. Its totient is φ = 10210600.

The previous prime is 20421187. The next prime is 20421209. The reversal of 20421202 is 20212402.

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

It can be written as a sum of positive squares in only one way, i.e., 15452761 + 4968441 = 3931^2 + 2229^2 .

It is a super-2 number, since 2×20421202² = 834050982249608, which contains 22 as substring.

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 not an unprimeable number, because it can be changed into a prime (20421209) 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, 5105299 + ... + 5105302.

Almost surely, 2^20421202 is an apocalyptic number.

20421202 is a deficient number, since it is larger than the sum of its proper divisors (10210604).

20421202 is a wasteful number, since it uses less digits than its factorization.

20421202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10210603.

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

The square root of 20421202 is about 4518.9824075781. The cubic root of 20421202 is about 273.3340693351.

Adding to 20421202 its reverse (20212402), we get a palindrome (40633604).

The spelling of 20421202 in words is "twenty million, four hundred twenty-one thousand, two hundred two".