20443545 has 24 divisors (see below), whose sum is σ = 35685000. Its totient is φ = 10826496.

The previous prime is 20443529. The next prime is 20443561. The reversal of 20443545 is 54534402.

It is an interprime number because it is at equal distance from previous prime (20443529) and next prime (20443561).

It can be written as a sum of positive squares in 4 ways, for example, as 301401 + 20142144 = 549^2 + 4488^2 .

It is not a de Polignac number, because 20443545 - 2⁴ = 20443529 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5181 + ... + 8229.

It is an arithmetic number, because the mean of its divisors is an integer number (1486875).

Almost surely, 2^20443545 is an apocalyptic number.

It is an amenable number.

20443545 is a deficient number, since it is larger than the sum of its proper divisors (15241455).

20443545 is a wasteful number, since it uses less digits than its factorization.

20443545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209 (or 3206 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 20443545 is about 4521.4538591033. The cubic root of 20443545 is about 273.4337186634.

Adding to 20443545 its reverse (54534402), we get a palindrome (74977947).

It can be divided in two parts, 204435 and 45, that added together give a triangular number (204480 = T₆₃₉).

The spelling of 20443545 in words is "twenty million, four hundred forty-three thousand, five hundred forty-five".