20243145 has 16 divisors (see below), whose sum is σ = 34880832. Its totient is φ = 9965760.

The previous prime is 20243143. The next prime is 20243149. The reversal of 20243145 is 54134202.

It is not a de Polignac number, because 20243145 - 2¹ = 20243143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20243143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51711 + ... + 52100.

It is an arithmetic number, because the mean of its divisors is an integer number (2180052).

Almost surely, 2^20243145 is an apocalyptic number.

It is an amenable number.

20243145 is a deficient number, since it is larger than the sum of its proper divisors (14637687).

20243145 is a wasteful number, since it uses less digits than its factorization.

20243145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103832.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20243145 is about 4499.2382688629. The cubic root of 20243145 is about 272.5373290051.

Adding to 20243145 its reverse (54134202), we get a palindrome (74377347).

The spelling of 20243145 in words is "twenty million, two hundred forty-three thousand, one hundred forty-five".