20424145 has 16 divisors (see below), whose sum is σ = 29485440. Its totient is φ = 13267584.

The previous prime is 20424143. The next prime is 20424169. The reversal of 20424145 is 54142402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20424145 - 2¹ = 20424143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20424143) 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, 14692 + ... + 16021.

It is an arithmetic number, because the mean of its divisors is an integer number (1842840).

Almost surely, 2^20424145 is an apocalyptic number.

It is an amenable number.

20424145 is a deficient number, since it is larger than the sum of its proper divisors (9061295).

20424145 is a wasteful number, since it uses less digits than its factorization.

20424145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30744.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 20424145 is about 4519.3080222530. The cubic root of 20424145 is about 273.3471992107.

Adding to 20424145 its reverse (54142402), we get a palindrome (74566547).

The spelling of 20424145 in words is "twenty million, four hundred twenty-four thousand, one hundred forty-five".