20423403144 has 96 divisors (see below), whose sum is σ = 56768788440. Its totient is φ = 6629299200.

The previous prime is 20423403097. The next prime is 20423403151. The reversal of 20423403144 is 44130432402.

It is a happy number.

20423403144 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 340 + 314 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13639904100 + 6783499044 = 116790^2 + 82362^2 .

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 23 ways as a sum of consecutive naturals, for example, 1638054 + ... + 1650474.

Almost surely, 2^20423403144 is an apocalyptic number.

20423403144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20423403144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28384394220).

20423403144 is an abundant number, since it is smaller than the sum of its proper divisors (36345385296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20423403144 is a wasteful number, since it uses less digits than its factorization.

20423403144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13031 (or 13024 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 20423403144 its reverse (44130432402), we get a palindrome (64553835546).

The spelling of 20423403144 in words is "twenty billion, four hundred twenty-three million, four hundred three thousand, one hundred forty-four".