20103499 has 4 divisors (see below), whose sum is σ = 21649936. Its totient is φ = 18557064.

The previous prime is 20103493. The next prime is 20103509. The reversal of 20103499 is 99430102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99430102 = 2 ⋅49715051.

It is a cyclic number.

It is not a de Polignac number, because 20103499 - 2⁷ = 20103371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20103493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773199 + ... + 773224.

It is an arithmetic number, because the mean of its divisors is an integer number (5412484).

Almost surely, 2^20103499 is an apocalyptic number.

20103499 is a deficient number, since it is larger than the sum of its proper divisors (1546437).

20103499 is a wasteful number, since it uses less digits than its factorization.

20103499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546436.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20103499 is about 4483.6925630556. The cubic root of 20103499 is about 271.9091887952.

It can be divided in two parts, 20103 and 499, that added together give a palindrome (20602).

The spelling of 20103499 in words is "twenty million, one hundred three thousand, four hundred ninety-nine".