20705071605 has 8 divisors (see below), whose sum is σ = 33128114592. Its totient is φ = 11042704848.

The previous prime is 20705071601. The next prime is 20705071619. The reversal of 20705071605 is 50617050702.

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

It is not a de Polignac number, because 20705071605 - 2² = 20705071601 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20705071601) 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, 690169039 + ... + 690169068.

It is an arithmetic number, because the mean of its divisors is an integer number (4141014324).

Almost surely, 2^20705071605 is an apocalyptic number.

It is an amenable number.

20705071605 is a deficient number, since it is larger than the sum of its proper divisors (12423042987).

20705071605 is a wasteful number, since it uses less digits than its factorization.

20705071605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380338115.

The product of its (nonzero) digits is 14700, while the sum is 33.

The spelling of 20705071605 in words is "twenty billion, seven hundred five million, seventy-one thousand, six hundred five".