20439115 has 16 divisors (see below), whose sum is σ = 25310880. Its totient is φ = 15834880.

The previous prime is 20439103. The next prime is 20439121. The reversal of 20439115 is 51193402.

It is not a de Polignac number, because 20439115 - 2¹⁹ = 19914827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20439115.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36417 + ... + 36973.

It is an arithmetic number, because the mean of its divisors is an integer number (1581930).

Almost surely, 2^20439115 is an apocalyptic number.

20439115 is a deficient number, since it is larger than the sum of its proper divisors (4871765).

20439115 is a wasteful number, since it uses less digits than its factorization.

20439115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20439115 is about 4520.9639458859. The cubic root of 20439115 is about 273.4139667257.

The spelling of 20439115 in words is "twenty million, four hundred thirty-nine thousand, one hundred fifteen".