19737803680 has 144 divisors (see below), whose sum is σ = 56114833320. Its totient is φ = 6533818368.

The previous prime is 19737803663. The next prime is 19737803681. The reversal of 19737803680 is 8630873791.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17532937744 + 2204865936 = 132412^2 + 46956^2 .

It is a super-2 number, since 2×19737803680² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19737803681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183954 + ... + 270766.

Almost surely, 2^19737803680 is an apocalyptic number.

19737803680 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 19737803680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28057416660).

19737803680 is an abundant number, since it is smaller than the sum of its proper divisors (36377029640).

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

19737803680 is a wasteful number, since it uses less digits than its factorization.

19737803680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86871 (or 86856 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 19737803680 in words is "nineteen billion, seven hundred thirty-seven million, eight hundred three thousand, six hundred eighty".