20464817 has 2 divisors, whose sum is σ = 20464818. Its totient is φ = 20464816.

The previous prime is 20464789. The next prime is 20464823. The reversal of 20464817 is 71846402.

20464817 is nontrivially palindromic in base 4.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18181696 + 2283121 = 4264^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 20464817 - 2¹² = 20460721 is a prime.

It is a Chen prime.

It is equal to p_1298156 and since 20464817 and 1298156 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20464217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232408 + 10232409.

It is an arithmetic number, because the mean of its divisors is an integer number (10232409).

Almost surely, 2^20464817 is an apocalyptic number.

It is an amenable number.

20464817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20464817 is an equidigital number, since it uses as much as digits as its factorization.

20464817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20464817 is about 4523.8055882188. The cubic root of 20464817 is about 273.5285239076.

The spelling of 20464817 in words is "twenty million, four hundred sixty-four thousand, eight hundred seventeen".