20103507 has 6 divisors (see below), whose sum is σ = 29038412. Its totient is φ = 13402332.

The previous prime is 20103493. The next prime is 20103509. The reversal of 20103507 is 70530102.

It is not a de Polignac number, because 20103507 - 2⁶ = 20103443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20103507.

It is not an unprimeable number, because it can be changed into a prime (20103509) 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, 1116853 + ... + 1116870.

Almost surely, 2^20103507 is an apocalyptic number.

20103507 is a deficient number, since it is larger than the sum of its proper divisors (8934905).

20103507 is a wasteful number, since it uses less digits than its factorization.

20103507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233729 (or 2233726 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 20103507 is about 4483.6934551773. The cubic root of 20103507 is about 271.9092248631.

Adding to 20103507 its reverse (70530102), we get a palindrome (90633609).

The spelling of 20103507 in words is "twenty million, one hundred three thousand, five hundred seven".