20400312423 has 8 divisors (see below), whose sum is σ = 27201098368. Its totient is φ = 13599867384.

The previous prime is 20400312419. The next prime is 20400312463. The reversal of 20400312423 is 32421300402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20400312423 - 2² = 20400312419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20400312423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400312463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137736 + ... + 244482.

It is an arithmetic number, because the mean of its divisors is an integer number (3400137296).

Almost surely, 2^20400312423 is an apocalyptic number.

20400312423 is a deficient number, since it is larger than the sum of its proper divisors (6800785945).

20400312423 is a wasteful number, since it uses less digits than its factorization.

20400312423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170453.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20400312423 its reverse (32421300402), we get a palindrome (52821612825).

The spelling of 20400312423 in words is "twenty billion, four hundred million, three hundred twelve thousand, four hundred twenty-three".