20440615 has 16 divisors (see below), whose sum is σ = 26597088. Its totient is φ = 14990976.

The previous prime is 20440601. The next prime is 20440639. The reversal of 20440615 is 51604402.

It is not a de Polignac number, because 20440615 - 2⁷ = 20440487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9204 + ... + 11206.

It is an arithmetic number, because the mean of its divisors is an integer number (1662318).

Almost surely, 2^20440615 is an apocalyptic number.

20440615 is a deficient number, since it is larger than the sum of its proper divisors (6156473).

20440615 is a wasteful number, since it uses less digits than its factorization.

20440615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20440615 is about 4521.1298366669. The cubic root of 20440615 is about 273.4206550603.

The spelling of 20440615 in words is "twenty million, four hundred forty thousand, six hundred fifteen".