20424091 has 4 divisors (see below), whose sum is σ = 21128400. Its totient is φ = 19719784.

The previous prime is 20424067. The next prime is 20424101. The reversal of 20424091 is 19042402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19042402 = 2 ⋅9521201.

It is a cyclic number.

It is not a de Polignac number, because 20424091 - 2¹¹ = 20422043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20424491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352111 + ... + 352168.

It is an arithmetic number, because the mean of its divisors is an integer number (5282100).

Almost surely, 2^20424091 is an apocalyptic number.

20424091 is a deficient number, since it is larger than the sum of its proper divisors (704309).

20424091 is an equidigital number, since it uses as much as digits as its factorization.

20424091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704308.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20424091 is about 4519.3020478831. The cubic root of 20424091 is about 273.3469583069.

Adding to 20424091 its reverse (19042402), we get a palindrome (39466493).

The spelling of 20424091 in words is "twenty million, four hundred twenty-four thousand, ninety-one".