20668503 has 16 divisors (see below), whose sum is σ = 28631520. Its totient is φ = 13246464.

The previous prime is 20668493. The next prime is 20668511. The reversal of 20668503 is 30586602.

It is not a de Polignac number, because 20668503 - 2⁸ = 20668247 is a prime.

It is a super-2 number, since 2×20668503² = 854374032522018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30375 + ... + 31047.

It is an arithmetic number, because the mean of its divisors is an integer number (1789470).

Almost surely, 2^20668503 is an apocalyptic number.

20668503 is a deficient number, since it is larger than the sum of its proper divisors (7963017).

20668503 is a wasteful number, since it uses less digits than its factorization.

20668503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20668503 is about 4546.2625309148. The cubic root of 20668503 is about 274.4330047750.

The spelling of 20668503 in words is "twenty million, six hundred sixty-eight thousand, five hundred three".