20434402144 has 48 divisors (see below), whose sum is σ = 43478204112. Its totient is φ = 9397882368.

The previous prime is 20434402127. The next prime is 20434402171. The reversal of 20434402144 is 44120443402.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 30942 + ... + 204514.

It is an arithmetic number, because the mean of its divisors is an integer number (905795919).

Almost surely, 2^20434402144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20434402144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21739102056).

20434402144 is an abundant number, since it is smaller than the sum of its proper divisors (23043801968).

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

20434402144 is a wasteful number, since it uses less digits than its factorization.

20434402144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173879 (or 173871 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 20434402144 its reverse (44120443402), we get a palindrome (64554845546).

The spelling of 20434402144 in words is "twenty billion, four hundred thirty-four million, four hundred two thousand, one hundred forty-four".