20710161617 has 4 divisors (see below), whose sum is σ = 21928406436. Its totient is φ = 19491916800.

The previous prime is 20710161601. The next prime is 20710161629. The reversal of 20710161617 is 71616101702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71616101702 = 2 ⋅35808050851.

It can be written as a sum of positive squares in 2 ways, for example, as 6338707456 + 14371454161 = 79616^2 + 119881^2 .

It is a cyclic number.

It is not a de Polignac number, because 20710161617 - 2⁴ = 20710161601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20710161317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609122384 + ... + 609122417.

It is an arithmetic number, because the mean of its divisors is an integer number (5482101609).

Almost surely, 2^20710161617 is an apocalyptic number.

It is an amenable number.

20710161617 is a deficient number, since it is larger than the sum of its proper divisors (1218244819).

20710161617 is a wasteful number, since it uses less digits than its factorization.

20710161617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218244818.

The product of its (nonzero) digits is 3528, while the sum is 32.

The spelling of 20710161617 in words is "twenty billion, seven hundred ten million, one hundred sixty-one thousand, six hundred seventeen".