20256503 has 4 divisors (see below), whose sum is σ = 21448080. Its totient is φ = 19064928.

The previous prime is 20256497. The next prime is 20256521. The reversal of 20256503 is 30565202.

It is a happy number.

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 20256503 - 2²⁰ = 19207927 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 (20256403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 595763 + ... + 595796.

It is an arithmetic number, because the mean of its divisors is an integer number (5362020).

Almost surely, 2^20256503 is an apocalyptic number.

20256503 is a deficient number, since it is larger than the sum of its proper divisors (1191577).

20256503 is a wasteful number, since it uses less digits than its factorization.

20256503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191576.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20256503 is about 4500.7224975553. The cubic root of 20256503 is about 272.5972629261.

The spelling of 20256503 in words is "twenty million, two hundred fifty-six thousand, five hundred three".