20702117 has 4 divisors (see below), whose sum is σ = 20757120. Its totient is φ = 20647116.

The previous prime is 20702111. The next prime is 20702131. The reversal of 20702117 is 71120702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20702117 - 2⁶ = 20702053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20702111) 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, 26933 + ... + 27690.

It is an arithmetic number, because the mean of its divisors is an integer number (5189280).

Almost surely, 2^20702117 is an apocalyptic number.

It is an amenable number.

20702117 is a deficient number, since it is larger than the sum of its proper divisors (55003).

20702117 is an equidigital number, since it uses as much as digits as its factorization.

20702117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55002.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 20702117 is about 4549.9579118933. The cubic root of 20702117 is about 274.5816979283.

Adding to 20702117 its reverse (71120702), we get a palindrome (91822819).

The spelling of 20702117 in words is "twenty million, seven hundred two thousand, one hundred seventeen".