20344457980 has 144 divisors (see below), whose sum is σ = 54295920000. Its totient is φ = 6331866240.

The previous prime is 20344457953. The next prime is 20344457981. The reversal of 20344457980 is 8975444302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20344457980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344457981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13571271 + ... + 13572769.

It is an arithmetic number, because the mean of its divisors is an integer number (377055000).

Almost surely, 2^20344457980 is an apocalyptic number.

20344457980 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 20344457980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27147960000).

20344457980 is an abundant number, since it is smaller than the sum of its proper divisors (33951462020).

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

20344457980 is a wasteful number, since it uses less digits than its factorization.

20344457980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792 (or 2783 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 20344457980 in words is "twenty billion, three hundred forty-four million, four hundred fifty-seven thousand, nine hundred eighty".