20344817 has 2 divisors, whose sum is σ = 20344818. Its totient is φ = 20344816.

The previous prime is 20344813. The next prime is 20344823. The reversal of 20344817 is 71844302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14371681 + 5973136 = 3791^2 + 2444^2 .

It is a cyclic number.

It is not a de Polignac number, because 20344817 - 2² = 20344813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20344817.

It is not a weakly prime, because it can be changed into another prime (20344813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172408 + 10172409.

It is an arithmetic number, because the mean of its divisors is an integer number (10172409).

Almost surely, 2^20344817 is an apocalyptic number.

It is an amenable number.

20344817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20344817 is an equidigital number, since it uses as much as digits as its factorization.

20344817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20344817 is about 4510.5229186869. The cubic root of 20344817 is about 272.9928437613.

The spelling of 20344817 in words is "twenty million, three hundred forty-four thousand, eight hundred seventeen".