20570117 has 2 divisors, whose sum is σ = 20570118. Its totient is φ = 20570116.

The previous prime is 20570101. The next prime is 20570167. The reversal of 20570117 is 71107502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18241441 + 2328676 = 4271^2 + 1526^2 .

It is a cyclic number.

It is not a de Polignac number, because 20570117 - 2⁴ = 20570101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20570092 and 20570101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20570167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10285058 + 10285059.

It is an arithmetic number, because the mean of its divisors is an integer number (10285059).

Almost surely, 2^20570117 is an apocalyptic number.

It is an amenable number.

20570117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20570117 is an equidigital number, since it uses as much as digits as its factorization.

20570117 is an evil number, because the sum of its binary digits is even.

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

The square root of 20570117 is about 4535.4290866466. The cubic root of 20570117 is about 273.9968609227.

Adding to 20570117 its reverse (71107502), we get a palindrome (91677619).

The spelling of 20570117 in words is "twenty million, five hundred seventy thousand, one hundred seventeen".