20109503 has 2 divisors, whose sum is σ = 20109504. Its totient is φ = 20109502.

The previous prime is 20109493. The next prime is 20109517. The reversal of 20109503 is 30590102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20109503 - 2¹⁴ = 20093119 is a prime.

It is a super-2 number, since 2×20109503² = 808784221814018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20109553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054751 + 10054752.

It is an arithmetic number, because the mean of its divisors is an integer number (10054752).

Almost surely, 2^20109503 is an apocalyptic number.

20109503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109503 is an equidigital number, since it uses as much as digits as its factorization.

20109503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 20109503 is about 4484.3620505040. The cubic root of 20109503 is about 271.9362550665.

Adding to 20109503 its reverse (30590102), we get a palindrome (50699605).

The spelling of 20109503 in words is "twenty million, one hundred nine thousand, five hundred three".