20443310040 has 128 divisors (see below), whose sum is σ = 61868252160. Its totient is φ = 5403884544.

The previous prime is 20443309979. The next prime is 20443310051. The reversal of 20443310040 is 4001334402.

It is a junction number, because it is equal to n+sod(n) for n = 20443309989 and 20443310016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8937777 + ... + 8940063.

It is an arithmetic number, because the mean of its divisors is an integer number (483345720).

Almost surely, 2^20443310040 is an apocalyptic number.

20443310040 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 20443310040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30934126080).

20443310040 is an abundant number, since it is smaller than the sum of its proper divisors (41424942120).

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

20443310040 is a wasteful number, since it uses less digits than its factorization.

20443310040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921 (or 2917 counting only the distinct ones).

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

Adding to 20443310040 its reverse (4001334402), we get a palindrome (24444644442).

The spelling of 20443310040 in words is "twenty billion, four hundred forty-three million, three hundred ten thousand, forty".