20400244403 has 8 divisors (see below), whose sum is σ = 25434071040. Its totient is φ = 15896294280.

The previous prime is 20400244379. The next prime is 20400244421. The reversal of 20400244403 is 30444200402.

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 20400244403 - 2⁸ = 20400244147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20400244433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132469043 + ... + 132469196.

It is an arithmetic number, because the mean of its divisors is an integer number (3179258880).

Almost surely, 2^20400244403 is an apocalyptic number.

20400244403 is a deficient number, since it is larger than the sum of its proper divisors (5033826637).

20400244403 is a wasteful number, since it uses less digits than its factorization.

20400244403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264938257.

The product of its (nonzero) digits is 3072, while the sum is 23.

Adding to 20400244403 its reverse (30444200402), we get a palindrome (50844444805).

The spelling of 20400244403 in words is "twenty billion, four hundred million, two hundred forty-four thousand, four hundred three".