20443445 has 8 divisors (see below), whose sum is σ = 26762400. Its totient is φ = 14867920.

The previous prime is 20443439. The next prime is 20443453. The reversal of 20443445 is 54434402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20443445 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185795 + ... + 185904.

It is an arithmetic number, because the mean of its divisors is an integer number (3345300).

Almost surely, 2^20443445 is an apocalyptic number.

It is an amenable number.

20443445 is a deficient number, since it is larger than the sum of its proper divisors (6318955).

20443445 is a wasteful number, since it uses less digits than its factorization.

20443445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371715.

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 20443445 is about 4521.4428006998. The cubic root of 20443445 is about 273.4332728272.

Adding to 20443445 its reverse (54434402), we get a palindrome (74877847).

The spelling of 20443445 in words is "twenty million, four hundred forty-three thousand, four hundred forty-five".