20103453 has 6 divisors (see below), whose sum is σ = 29038334. Its totient is φ = 13402296.

The previous prime is 20103443. The next prime is 20103487. The reversal of 20103453 is 35430102.

It can be written as a sum of positive squares in only one way, i.e., 20088324 + 15129 = 4482^2 + 123^2 .

It is not a de Polignac number, because 20103453 - 2¹² = 20099357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103443) 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 5 ways as a sum of consecutive naturals, for example, 1116850 + ... + 1116867.

Almost surely, 2^20103453 is an apocalyptic number.

It is an amenable number.

20103453 is a deficient number, since it is larger than the sum of its proper divisors (8934881).

20103453 is a wasteful number, since it uses less digits than its factorization.

20103453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233723 (or 2233720 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20103453 is about 4483.6874333522. The cubic root of 20103453 is about 271.9089814045.

Adding to 20103453 its reverse (35430102), we get a palindrome (55533555).

The spelling of 20103453 in words is "twenty million, one hundred three thousand, four hundred fifty-three".