20403401 has 2 divisors, whose sum is σ = 20403402. Its totient is φ = 20403400.

The previous prime is 20403389. The next prime is 20403407. The reversal of 20403401 is 10430402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20259001 + 144400 = 4501^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403401 - 2⁶ = 20403337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20403407) 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, 10201700 + 10201701.

It is an arithmetic number, because the mean of its divisors is an integer number (10201701).

Almost surely, 2^20403401 is an apocalyptic number.

It is an amenable number.

20403401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403401 is an equidigital number, since it uses as much as digits as its factorization.

20403401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20403401 is about 4517.0123975920. The cubic root of 20403401 is about 273.2546251994.

Adding to 20403401 its reverse (10430402), we get a palindrome (30833803).

The spelling of 20403401 in words is "twenty million, four hundred three thousand, four hundred one".