20938403 has 2 divisors, whose sum is σ = 20938404. Its totient is φ = 20938402.

The previous prime is 20938387. The next prime is 20938417. The reversal of 20938403 is 30483902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20938403 - 2⁴ = 20938387 is a prime.

It is not a weakly prime, because it can be changed into another prime (20938903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10469201 + 10469202.

It is an arithmetic number, because the mean of its divisors is an integer number (10469202).

Almost surely, 2^20938403 is an apocalyptic number.

20938403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20938403 is an equidigital number, since it uses as much as digits as its factorization.

20938403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20938403 is about 4575.8499756876. The cubic root of 20938403 is about 275.6224051291.

The spelling of 20938403 in words is "twenty million, nine hundred thirty-eight thousand, four hundred three".