20617360705 has 8 divisors (see below), whose sum is σ = 25409504232. Its totient is φ = 16048107648.

The previous prime is 20617360697. The next prime is 20617360711. The reversal of 20617360705 is 50706371602.

It can be written as a sum of positive squares in 4 ways, for example, as 12890423296 + 7726937409 = 113536^2 + 87903^2 .

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 20617360705 - 2³ = 20617360697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55722412 + ... + 55722781.

It is an arithmetic number, because the mean of its divisors is an integer number (3176188029).

Almost surely, 2^20617360705 is an apocalyptic number.

It is an amenable number.

20617360705 is a deficient number, since it is larger than the sum of its proper divisors (4792143527).

20617360705 is a wasteful number, since it uses less digits than its factorization.

20617360705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111445235.

The product of its (nonzero) digits is 52920, while the sum is 37.

The spelling of 20617360705 in words is "twenty billion, six hundred seventeen million, three hundred sixty thousand, seven hundred five".