20113431040 has 60 divisors (see below), whose sum is σ = 48242304594. Its totient is φ = 8042502144.

The previous prime is 20113431001. The next prime is 20113431043. The reversal of 20113431040 is 4013431102.

It can be written as a sum of positive squares in only one way, i.e., 18102087936 + 2011343104 = 134544^2 + 44848^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20113430999 and 20113431017.

It is not an unprimeable number, because it can be changed into a prime (20113431043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7174279 + ... + 7177081.

Almost surely, 2^20113431040 is an apocalyptic number.

20113431040 is a gapful number since it is divisible by the number (20) 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 20113431040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24121152297).

20113431040 is an abundant number, since it is smaller than the sum of its proper divisors (28128873554).

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

20113431040 is an frugal number, since it uses more digits than its factorization.

20113431040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629 (or 2810 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20113431040 its reverse (4013431102), we get a palindrome (24126862142).

The spelling of 20113431040 in words is "twenty billion, one hundred thirteen million, four hundred thirty-one thousand, forty".