19980737220 has 96 divisors (see below), whose sum is σ = 56619343872. Its totient is φ = 5264316288.

The previous prime is 19980737197. The next prime is 19980737233. The reversal of 19980737220 is 2273708991.

It is a self number, because there is not a number n which added to its sum of digits gives 19980737220.

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, 2857849 + ... + 2864831.

It is an arithmetic number, because the mean of its divisors is an integer number (589784832).

Almost surely, 2^19980737220 is an apocalyptic number.

19980737220 is a gapful number since it is divisible by the number (10) 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 19980737220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28309671936).

19980737220 is an abundant number, since it is smaller than the sum of its proper divisors (36638606652).

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

19980737220 is a wasteful number, since it uses less digits than its factorization.

19980737220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7561 (or 7559 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The spelling of 19980737220 in words is "nineteen billion, nine hundred eighty million, seven hundred thirty-seven thousand, two hundred twenty".