20949503 has 4 divisors (see below), whose sum is σ = 20979360. Its totient is φ = 20919648.

The previous prime is 20949499. The next prime is 20949529. The reversal of 20949503 is 30594902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20949503 - 2² = 20949499 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 20949503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20949563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13850 + ... + 15287.

It is an arithmetic number, because the mean of its divisors is an integer number (5244840).

Almost surely, 2^20949503 is an apocalyptic number.

20949503 is a deficient number, since it is larger than the sum of its proper divisors (29857).

20949503 is an equidigital number, since it uses as much as digits as its factorization.

20949503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29856.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 20949503 is about 4577.0627043990. The cubic root of 20949503 is about 275.6711014286.

The spelling of 20949503 in words is "twenty million, nine hundred forty-nine thousand, five hundred three".