20005660653 has 8 divisors (see below), whose sum is σ = 29099142816. Its totient is φ = 12124642800.

The previous prime is 20005660651. The next prime is 20005660681. The reversal of 20005660653 is 35606650002.

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

It is not a de Polignac number, because 20005660653 - 2¹ = 20005660651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 606232141 = 20005660653 / (2 + 0 + 0 + 0 + 5 + 6 + 6 + 0 + 6 + 5 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005660651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303116038 + ... + 303116103.

It is an arithmetic number, because the mean of its divisors is an integer number (3637392852).

Almost surely, 2^20005660653 is an apocalyptic number.

It is an amenable number.

20005660653 is a deficient number, since it is larger than the sum of its proper divisors (9093482163).

20005660653 is a wasteful number, since it uses less digits than its factorization.

20005660653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606232155.

The product of its (nonzero) digits is 32400, while the sum is 33.

The spelling of 20005660653 in words is "twenty billion, five million, six hundred sixty thousand, six hundred fifty-three".