20637560617 has 8 divisors (see below), whose sum is σ = 21499238880. Its totient is φ = 19792945440.

The previous prime is 20637560611. The next prime is 20637560621. The reversal of 20637560617 is 71606573602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20637560617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20637560611) 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, 4263303 + ... + 4268140.

It is an arithmetic number, because the mean of its divisors is an integer number (2687404860).

Almost surely, 2^20637560617 is an apocalyptic number.

It is an amenable number.

20637560617 is a deficient number, since it is larger than the sum of its proper divisors (861678263).

20637560617 is an equidigital number, since it uses as much as digits as its factorization.

20637560617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8531543.

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 20637560617 in words is "twenty billion, six hundred thirty-seven million, five hundred sixty thousand, six hundred seventeen".