20356117 has 2 divisors, whose sum is σ = 20356118. Its totient is φ = 20356116.

The previous prime is 20356111. The next prime is 20356139. The reversal of 20356117 is 71165302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14814801 + 5541316 = 3849^2 + 2354^2 .

It is a cyclic number.

It is not a de Polignac number, because 20356117 - 2¹⁹ = 19831829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20356091 and 20356100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20356111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178058 + 10178059.

It is an arithmetic number, because the mean of its divisors is an integer number (10178059).

Almost surely, 2^20356117 is an apocalyptic number.

It is an amenable number.

20356117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356117 is an equidigital number, since it uses as much as digits as its factorization.

20356117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20356117 is about 4511.7753711815. The cubic root of 20356117 is about 273.0433766674.

The spelling of 20356117 in words is "twenty million, three hundred fifty-six thousand, one hundred seventeen".