20425417 has 2 divisors, whose sum is σ = 20425418. Its totient is φ = 20425416.

The previous prime is 20425397. The next prime is 20425429. The reversal of 20425417 is 71452402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17480761 + 2944656 = 4181^2 + 1716^2 .

It is a cyclic number.

It is not a de Polignac number, because 20425417 - 2⁷ = 20425289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20425391 and 20425400.

It is not a weakly prime, because it can be changed into another prime (20425477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212708 + 10212709.

It is an arithmetic number, because the mean of its divisors is an integer number (10212709).

Almost surely, 2^20425417 is an apocalyptic number.

It is an amenable number.

20425417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425417 is an equidigital number, since it uses as much as digits as its factorization.

20425417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 20425417 is about 4519.4487495711. The cubic root of 20425417 is about 273.3528737105.

Adding to 20425417 its reverse (71452402), we get a palindrome (91877819).

The spelling of 20425417 in words is "twenty million, four hundred twenty-five thousand, four hundred seventeen".