20665532533 has 8 divisors (see below), whose sum is σ = 21968572320. Its totient is φ = 19384030800.

The previous prime is 20665532479. The next prime is 20665532557. The reversal of 20665532533 is 33523556602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20665532533 - 2¹⁷ = 20665401461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665532593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5382535 + ... + 5386372.

It is an arithmetic number, because the mean of its divisors is an integer number (2746071540).

Almost surely, 2^20665532533 is an apocalyptic number.

It is an amenable number.

20665532533 is a deficient number, since it is larger than the sum of its proper divisors (1303039787).

20665532533 is a wasteful number, since it uses less digits than its factorization.

20665532533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10769027.

The product of its (nonzero) digits is 486000, while the sum is 40.

The spelling of 20665532533 in words is "twenty billion, six hundred sixty-five million, five hundred thirty-two thousand, five hundred thirty-three".