20665551652 has 12 divisors (see below), whose sum is σ = 36190139776. Its totient is φ = 10325511720.

The previous prime is 20665551631. The next prime is 20665551659. The reversal of 20665551652 is 25615556602.

It is a junction number, because it is equal to n+sod(n) for n = 20665551599 and 20665551608.

It is not an unprimeable number, because it can be changed into a prime (20665551659) by changing a digit.

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, 1809624 + ... + 1821007.

Almost surely, 2^20665551652 is an apocalyptic number.

It is an amenable number.

20665551652 is a deficient number, since it is larger than the sum of its proper divisors (15524588124).

20665551652 is a wasteful number, since it uses less digits than its factorization.

20665551652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632058 (or 3632056 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 20665551652 in words is "twenty billion, six hundred sixty-five million, five hundred fifty-one thousand, six hundred fifty-two".