20263409 has 2 divisors, whose sum is σ = 20263410. Its totient is φ = 20263408.

The previous prime is 20263387. The next prime is 20263417. The reversal of 20263409 is 90436202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 327184 = 4465^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 20263409 - 2⁸ = 20263153 is a prime.

It is equal to p_1286261 and since 20263409 and 1286261 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 (20263459) 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, 10131704 + 10131705.

It is an arithmetic number, because the mean of its divisors is an integer number (10131705).

Almost surely, 2^20263409 is an apocalyptic number.

It is an amenable number.

20263409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20263409 is an equidigital number, since it uses as much as digits as its factorization.

20263409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20263409 is about 4501.4896423295. The cubic root of 20263409 is about 272.6282380455.

The spelling of 20263409 in words is "twenty million, two hundred sixty-three thousand, four hundred nine".