20661223312 has 20 divisors (see below), whose sum is σ = 40882847616. Its totient is φ = 10110811040.

The previous prime is 20661223301. The next prime is 20661223321. The reversal of 20661223312 is 21332216602.

It is a super-2 number, since 2×20661223312² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13736764 + ... + 13738267.

Almost surely, 2^20661223312 is an apocalyptic number.

It is an amenable number.

20661223312 is a deficient number, since it is larger than the sum of its proper divisors (20221624304).

20661223312 is a wasteful number, since it uses less digits than its factorization.

20661223312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27475086 (or 27475080 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 20661223312 its reverse (21332216602), we get a palindrome (41993439914).

The spelling of 20661223312 in words is "twenty billion, six hundred sixty-one million, two hundred twenty-three thousand, three hundred twelve".