20440402080 has 192 divisors, whose sum is σ = 73868433408. Its totient is φ = 4654126080.

The previous prime is 20440402069. The next prime is 20440402091. The reversal of 20440402080 is 8020404402.

It is an interprime number because it is at equal distance from previous prime (20440402069) and next prime (20440402091).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20440402080.

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, 872115 + ... + 895245.

It is an arithmetic number, because the mean of its divisors is an integer number (384731424).

Almost surely, 2^20440402080 is an apocalyptic number.

20440402080 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 20440402080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36934216704).

20440402080 is an abundant number, since it is smaller than the sum of its proper divisors (53428031328).

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

20440402080 is a wasteful number, since it uses less digits than its factorization.

20440402080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23419 (or 23411 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 20440402080 its reverse (8020404402), we get a palindrome (28460806482).

The spelling of 20440402080 in words is "twenty billion, four hundred forty million, four hundred two thousand, eighty".