20321142266 has 4 divisors (see below), whose sum is σ = 30481713402. Its totient is φ = 10160571132.

The previous prime is 20321142223. The next prime is 20321142269. The reversal of 20321142266 is 66224112302.

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., 20128515625 + 192626641 = 141875^2 + 13879^2 .

It is a super-2 number, since 2×20321142266² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20321142269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5080285565 + ... + 5080285568.

Almost surely, 2^20321142266 is an apocalyptic number.

20321142266 is a deficient number, since it is larger than the sum of its proper divisors (10160571136).

20321142266 is a wasteful number, since it uses less digits than its factorization.

20321142266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10160571135.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 20321142266 its reverse (66224112302), we get a palindrome (86545254568).

The spelling of 20321142266 in words is "twenty billion, three hundred twenty-one million, one hundred forty-two thousand, two hundred sixty-six".