20472017 has 2 divisors, whose sum is σ = 20472018. Its totient is φ = 20472016.

The previous prime is 20472013. The next prime is 20472031. The reversal of 20472017 is 71027402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12609601 + 7862416 = 3551^2 + 2804^2 .

It is a cyclic number.

It is not a de Polignac number, because 20472017 - 2² = 20472013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20471983 and 20472001.

It is not a weakly prime, because it can be changed into another prime (20472013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236008 + 10236009.

It is an arithmetic number, because the mean of its divisors is an integer number (10236009).

Almost surely, 2^20472017 is an apocalyptic number.

It is an amenable number.

20472017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20472017 is an equidigital number, since it uses as much as digits as its factorization.

20472017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 20472017 is about 4524.6013084028. The cubic root of 20472017 is about 273.5605980515.

Adding to 20472017 its reverse (71027402), we get a palindrome (91499419).

The spelling of 20472017 in words is "twenty million, four hundred seventy-two thousand, seventeen".