20424401 has 2 divisors, whose sum is σ = 20424402. Its totient is φ = 20424400.

The previous prime is 20424379. The next prime is 20424409. The reversal of 20424401 is 10442402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 5058001 = 3920^2 + 2249^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424401 - 2⁶ = 20424337 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20424401.

It is not a weakly prime, because it can be changed into another prime (20424409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212200 + 10212201.

It is an arithmetic number, because the mean of its divisors is an integer number (10212201).

Almost surely, 2^20424401 is an apocalyptic number.

It is an amenable number.

20424401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424401 is an equidigital number, since it uses as much as digits as its factorization.

20424401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 20424401 is about 4519.3363450843. The cubic root of 20424401 is about 273.3483412673.

Adding to 20424401 its reverse (10442402), we get a palindrome (30866803).

The spelling of 20424401 in words is "twenty million, four hundred twenty-four thousand, four hundred one".