20665463432 has 16 divisors (see below), whose sum is σ = 41027023260. Its totient is φ = 9724923904.

The previous prime is 20665463393. The next prime is 20665463447. The reversal of 20665463432 is 23436456602.

It can be written as a sum of positive squares in 2 ways, for example, as 18924404356 + 1741059076 = 137566^2 + 41726^2 .

It is a super-2 number, since 2×20665463432² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20665463432.

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, 75975833 + ... + 75976104.

Almost surely, 2^20665463432 is an apocalyptic number.

It is an amenable number.

20665463432 is a deficient number, since it is larger than the sum of its proper divisors (20361559828).

20665463432 is a wasteful number, since it uses less digits than its factorization.

20665463432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151951960 (or 151951956 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 20665463432 in words is "twenty billion, six hundred sixty-five million, four hundred sixty-three thousand, four hundred thirty-two".