20438417 has 12 divisors (see below), whose sum is σ = 21600180. Its totient is φ = 19315296.

The previous prime is 20438413. The next prime is 20438419. The reversal of 20438417 is 71483402.

It can be written as a sum of positive squares in 2 ways, for example, as 8300161 + 12138256 = 2881^2 + 3484^2 .

It is not a de Polignac number, because 20438417 - 2² = 20438413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20438417.

It is not an unprimeable number, because it can be changed into a prime (20438413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130103 + ... + 130259.

It is an arithmetic number, because the mean of its divisors is an integer number (1800015).

Almost surely, 2^20438417 is an apocalyptic number.

It is an amenable number.

20438417 is a deficient number, since it is larger than the sum of its proper divisors (1161763).

20438417 is an equidigital number, since it uses as much as digits as its factorization.

20438417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 253 counting only the distinct ones).

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

The square root of 20438417 is about 4520.8867493004. The cubic root of 20438417 is about 273.4108543091.

The spelling of 20438417 in words is "twenty million, four hundred thirty-eight thousand, four hundred seventeen".