20424243 has 16 divisors (see below), whose sum is σ = 31351040. Its totient is φ = 11585376.

The previous prime is 20424199. The next prime is 20424247. The reversal of 20424243 is 34242402.

It is not a de Polignac number, because 20424243 - 2¹⁴ = 20407859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20424247) 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, 580 + ... + 6417.

It is an arithmetic number, because the mean of its divisors is an integer number (1959440).

Almost surely, 2^20424243 is an apocalyptic number.

20424243 is a deficient number, since it is larger than the sum of its proper divisors (10926797).

20424243 is a wasteful number, since it uses less digits than its factorization.

20424243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7146.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 20424243 is about 4519.3188646078. The cubic root of 20424243 is about 273.3476364053.

Adding to 20424243 its reverse (34242402), we get a palindrome (54666645).

The spelling of 20424243 in words is "twenty million, four hundred twenty-four thousand, two hundred forty-three".