20440024257 has 8 divisors (see below), whose sum is σ = 27918082080. Its totient is φ = 13294324640.

The previous prime is 20440024247. The next prime is 20440024259. The reversal of 20440024257 is 75242004402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20440024257 - 2¹⁴ = 20440007873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20440024259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83089407 + ... + 83089652.

It is an arithmetic number, because the mean of its divisors is an integer number (3489760260).

Almost surely, 2^20440024257 is an apocalyptic number.

It is an amenable number.

20440024257 is a deficient number, since it is larger than the sum of its proper divisors (7478057823).

20440024257 is a wasteful number, since it uses less digits than its factorization.

20440024257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166179103.

The product of its (nonzero) digits is 17920, while the sum is 30.

Adding to 20440024257 its reverse (75242004402), we get a palindrome (95682028659).

The spelling of 20440024257 in words is "twenty billion, four hundred forty million, twenty-four thousand, two hundred fifty-seven".