20412817 has 2 divisors, whose sum is σ = 20412818. Its totient is φ = 20412816.

The previous prime is 20412811. The next prime is 20412871. The reversal of 20412817 is 71821402.

It is a happy number.

Together with next prime (20412871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18455616 + 1957201 = 4296^2 + 1399^2 .

It is a cyclic number.

It is not a de Polignac number, because 20412817 - 2¹⁵ = 20380049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20412791 and 20412800.

It is not a weakly prime, because it can be changed into another prime (20412811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206408 + 10206409.

It is an arithmetic number, because the mean of its divisors is an integer number (10206409).

Almost surely, 2^20412817 is an apocalyptic number.

20412817 is the 2609-th hex number.

It is an amenable number.

20412817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20412817 is an equidigital number, since it uses as much as digits as its factorization.

20412817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20412817 is about 4518.0545592102. The cubic root of 20412817 is about 273.2966536477.

The spelling of 20412817 in words is "twenty million, four hundred twelve thousand, eight hundred seventeen".