20665436312 has 32 divisors (see below), whose sum is σ = 40078190880. Its totient is φ = 9982813440.

The previous prime is 20665436299. The next prime is 20665436339. The reversal of 20665436312 is 21363456602.

It is a happy number.

It is a super-2 number, since 2×20665436312² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272063 + ... + 339630.

It is an arithmetic number, because the mean of its divisors is an integer number (1252443465).

Almost surely, 2^20665436312 is an apocalyptic number.

It is an amenable number.

20665436312 is a deficient number, since it is larger than the sum of its proper divisors (19412754568).

20665436312 is a wasteful number, since it uses less digits than its factorization.

20665436312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611843 (or 611839 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 20665436312 in words is "twenty billion, six hundred sixty-five million, four hundred thirty-six thousand, three hundred twelve".