20545503 has 32 divisors (see below), whose sum is σ = 32285952. Its totient is φ = 11481600.

The previous prime is 20545493. The next prime is 20545531. The reversal of 20545503 is 30554502.

It is not a de Polignac number, because 20545503 - 2⁴ = 20545487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545573) 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 31 ways as a sum of consecutive naturals, for example, 29388 + ... + 30078.

It is an arithmetic number, because the mean of its divisors is an integer number (1008936).

Almost surely, 2^20545503 is an apocalyptic number.

20545503 is a deficient number, since it is larger than the sum of its proper divisors (11740449).

20545503 is a wasteful number, since it uses less digits than its factorization.

20545503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775.

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 20545503 is about 4532.7147494631. The cubic root of 20545503 is about 273.8875299853.

It can be divided in two parts, 2054 and 5503, that added together give a palindrome (7557).

The spelling of 20545503 in words is "twenty million, five hundred forty-five thousand, five hundred three".