20440015 has 8 divisors (see below), whose sum is σ = 24721920. Its totient is φ = 16222752.

The previous prime is 20439959. The next prime is 20440039. The reversal of 20440015 is 51004402.

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 20440015 - 2²³ = 12051407 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15460 + ... + 16729.

It is an arithmetic number, because the mean of its divisors is an integer number (3090240).

Almost surely, 2^20440015 is an apocalyptic number.

20440015 is a deficient number, since it is larger than the sum of its proper divisors (4281905).

20440015 is a wasteful number, since it uses less digits than its factorization.

20440015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32321.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20440015 is about 4521.0634810850. The cubic root of 20440015 is about 273.4179797657.

Adding to 20440015 its reverse (51004402), we get a palindrome (71444417).

The spelling of 20440015 in words is "twenty million, four hundred forty thousand, fifteen".