20100403 has 2 divisors, whose sum is σ = 20100404. Its totient is φ = 20100402.

The previous prime is 20100401. The next prime is 20100419. The reversal of 20100403 is 30400102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20100403 - 2¹ = 20100401 is a prime.

Together with 20100401, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20100403.

It is not a weakly prime, because it can be changed into another prime (20100401) 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, 10050201 + 10050202.

It is an arithmetic number, because the mean of its divisors is an integer number (10050202).

Almost surely, 2^20100403 is an apocalyptic number.

20100403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100403 is an equidigital number, since it uses as much as digits as its factorization.

20100403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 20100403 is about 4483.3472986152. The cubic root of 20100403 is about 271.8952297978.

Adding to 20100403 its reverse (30400102), we get a palindrome (50500505).

It can be divided in two parts, 20100 and 403, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 20100403 in words is "twenty million, one hundred thousand, four hundred three".