20705117 has 8 divisors (see below), whose sum is σ = 22498560. Its totient is φ = 18982080.

The previous prime is 20705107. The next prime is 20705119. The reversal of 20705117 is 71150702.

It is a happy number.

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 20705117 - 2⁶ = 20705053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20705092 and 20705101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20705119) 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, 16988 + ... + 18165.

It is an arithmetic number, because the mean of its divisors is an integer number (2812320).

Almost surely, 2^20705117 is an apocalyptic number.

It is an amenable number.

20705117 is a deficient number, since it is larger than the sum of its proper divisors (1793443).

20705117 is a wasteful number, since it uses less digits than its factorization.

20705117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35203.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 20705117 is about 4550.2875733298. The cubic root of 20705117 is about 274.5949607475.

Adding to 20705117 its reverse (71150702), we get a palindrome (91855819).

The spelling of 20705117 in words is "twenty million, seven hundred five thousand, one hundred seventeen".