20113817 has 2 divisors, whose sum is σ = 20113818. Its totient is φ = 20113816.

The previous prime is 20113813. The next prime is 20113843. The reversal of 20113817 is 71831102.

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., 18627856 + 1485961 = 4316^2 + 1219^2 .

It is a cyclic number.

It is not a de Polignac number, because 20113817 - 2² = 20113813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20113792 and 20113801.

It is not a weakly prime, because it can be changed into another prime (20113813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056908 + 10056909.

It is an arithmetic number, because the mean of its divisors is an integer number (10056909).

Almost surely, 2^20113817 is an apocalyptic number.

It is an amenable number.

20113817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20113817 is an equidigital number, since it uses as much as digits as its factorization.

20113817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 20113817 is about 4484.8430295831. The cubic root of 20113817 is about 271.9556994244.

Adding to 20113817 its reverse (71831102), we get a palindrome (91944919).

The spelling of 20113817 in words is "twenty million, one hundred thirteen thousand, eight hundred seventeen".