20125717 has 4 divisors (see below), whose sum is σ = 20228076. Its totient is φ = 20023360.

The previous prime is 20125697. The next prime is 20125723. The reversal of 20125717 is 71752102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19766916 + 358801 = 4446^2 + 599^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20125717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20125691 and 20125700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125747) 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, 50884 + ... + 51277.

It is an arithmetic number, because the mean of its divisors is an integer number (5057019).

Almost surely, 2^20125717 is an apocalyptic number.

It is an amenable number.

20125717 is a deficient number, since it is larger than the sum of its proper divisors (102359).

20125717 is a wasteful number, since it uses less digits than its factorization.

20125717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102358.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 20125717 is about 4486.1695242155. The cubic root of 20125717 is about 272.0093215159.

Adding to 20125717 its reverse (71752102), we get a palindrome (91877819).

The spelling of 20125717 in words is "twenty million, one hundred twenty-five thousand, seven hundred seventeen".