20424040109 has 4 divisors (see below), whose sum is σ = 22280771040. Its totient is φ = 18567309180.

The previous prime is 20424040081. The next prime is 20424040121. The reversal of 20424040109 is 90104042402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20424040109 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424040009) 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, 928365449 + ... + 928365470.

It is an arithmetic number, because the mean of its divisors is an integer number (5570192760).

Almost surely, 2^20424040109 is an apocalyptic number.

It is an amenable number.

20424040109 is a deficient number, since it is larger than the sum of its proper divisors (1856730931).

20424040109 is a wasteful number, since it uses less digits than its factorization.

20424040109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856730930.

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 20424040109 in words is "twenty billion, four hundred twenty-four million, forty thousand, one hundred nine".