20440213040 has 80 divisors (see below), whose sum is σ = 51493558368. Its totient is φ = 7500791808.

The previous prime is 20440213009. The next prime is 20440213043. The reversal of 20440213040 is 4031204402.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20440213043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109232 + ... + 229808.

Almost surely, 2^20440213040 is an apocalyptic number.

20440213040 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 20440213040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25746779184).

20440213040 is an abundant number, since it is smaller than the sum of its proper divisors (31053345328).

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

20440213040 is a wasteful number, since it uses less digits than its factorization.

20440213040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120766 (or 120760 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20440213040 its reverse (4031204402), we get a palindrome (24471417442).

The spelling of 20440213040 in words is "twenty billion, four hundred forty million, two hundred thirteen thousand, forty".