20751117 has 8 divisors (see below), whose sum is σ = 28416096. Its totient is φ = 13460112.

The previous prime is 20751103. The next prime is 20751119. The reversal of 20751117 is 71115702.

It is a happy number.

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

It is not a de Polignac number, because 20751117 - 2¹⁴ = 20734733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20751119) 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, 93363 + ... + 93584.

It is an arithmetic number, because the mean of its divisors is an integer number (3552012).

Almost surely, 2^20751117 is an apocalyptic number.

It is an amenable number.

20751117 is a deficient number, since it is larger than the sum of its proper divisors (7664979).

20751117 is a wasteful number, since it uses less digits than its factorization.

20751117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186987.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 20751117 is about 4555.3393946006. The cubic root of 20751117 is about 274.7981637442.

Adding to 20751117 its reverse (71115702), we get a palindrome (91866819).

The spelling of 20751117 in words is "twenty million, seven hundred fifty-one thousand, one hundred seventeen".