20018445 has 8 divisors (see below), whose sum is σ = 32029536. Its totient is φ = 10676496.

The previous prime is 20018437. The next prime is 20018459. The reversal of 20018445 is 54481002.

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

It is not a de Polignac number, because 20018445 - 2³ = 20018437 is a prime.

It is a Curzon number.

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, 667267 + ... + 667296.

It is an arithmetic number, because the mean of its divisors is an integer number (4003692).

Almost surely, 2^20018445 is an apocalyptic number.

It is an amenable number.

20018445 is a deficient number, since it is larger than the sum of its proper divisors (12011091).

20018445 is a wasteful number, since it uses less digits than its factorization.

20018445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334571.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 20018445 is about 4474.1976934418. The cubic root of 20018445 is about 271.5251817416.

Adding to 20018445 its reverse (54481002), we get a palindrome (74499447).

The spelling of 20018445 in words is "twenty million, eighteen thousand, four hundred forty-five".