20243645 has 8 divisors (see below), whose sum is σ = 25571040. Its totient is φ = 15342480.

The previous prime is 20243623. The next prime is 20243659. The reversal of 20243645 is 54634202.

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

It is not a de Polignac number, because 20243645 - 2²⁰ = 19195069 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, 106451 + ... + 106640.

It is an arithmetic number, because the mean of its divisors is an integer number (3196380).

Almost surely, 2^20243645 is an apocalyptic number.

It is an amenable number.

20243645 is a deficient number, since it is larger than the sum of its proper divisors (5327395).

20243645 is a wasteful number, since it uses less digits than its factorization.

20243645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213115.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20243645 is about 4499.2938334810. The cubic root of 20243645 is about 272.5395728518.

Adding to 20243645 its reverse (54634202), we get a palindrome (74877847).

The spelling of 20243645 in words is "twenty million, two hundred forty-three thousand, six hundred forty-five".