20440879 has 4 divisors (see below), whose sum is σ = 20628520. Its totient is φ = 20253240.

The previous prime is 20440877. The next prime is 20440883. The reversal of 20440879 is 97804402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20440879 - 2¹ = 20440877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440877) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 93657 + ... + 93874.

It is an arithmetic number, because the mean of its divisors is an integer number (5157130).

Almost surely, 2^20440879 is an apocalyptic number.

20440879 is a deficient number, since it is larger than the sum of its proper divisors (187641).

20440879 is a wasteful number, since it uses less digits than its factorization.

20440879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187640.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20440879 is about 4521.1590328145. The cubic root of 20440879 is about 273.4218321733.

The spelling of 20440879 in words is "twenty million, four hundred forty thousand, eight hundred seventy-nine".