20400140032 has 72 divisors (see below), whose sum is σ = 42206964800. Its totient is φ = 9832845312.

The previous prime is 20400140021. The next prime is 20400140087. The reversal of 20400140032 is 23004100402.

It is a super-2 number, since 2×20400140032² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 20400139988 and 20400140015.

It is a congruent number.

It is an unprimeable number.

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, 1022569 + ... + 1042327.

Almost surely, 2^20400140032 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 20400140032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21103482400).

20400140032 is an abundant number, since it is smaller than the sum of its proper divisors (21806824768).

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

20400140032 is a wasteful number, since it uses less digits than its factorization.

20400140032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19921 (or 19907 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20400140032 its reverse (23004100402), we get a palindrome (43404240434).

The spelling of 20400140032 in words is "twenty billion, four hundred million, one hundred forty thousand, thirty-two".