20049403 has 4 divisors (see below), whose sum is σ = 21872088. Its totient is φ = 18226720.

The previous prime is 20049373. The next prime is 20049413. The reversal of 20049403 is 30494002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20049403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20049413) 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 in 3 ways as a sum of consecutive naturals, for example, 911326 + ... + 911347.

It is an arithmetic number, because the mean of its divisors is an integer number (5468022).

Almost surely, 2^20049403 is an apocalyptic number.

20049403 is a deficient number, since it is larger than the sum of its proper divisors (1822685).

20049403 is a wasteful number, since it uses less digits than its factorization.

20049403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822684.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20049403 is about 4477.6559715994. The cubic root of 20049403 is about 271.6650785074.

The spelling of 20049403 in words is "twenty million, forty-nine thousand, four hundred three".