19709802240 has 144 divisors (see below), whose sum is σ = 63009881088. Its totient is φ = 5250797568.

The previous prime is 19709802221. The next prime is 19709802241. The reversal of 19709802240 is 4220890791.

It is a junction number, because it is equal to n+sod(n) for n = 19709802192 and 19709802201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19709802241) 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, 5462517 + ... + 5466123.

Almost surely, 2^19709802240 is an apocalyptic number.

19709802240 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 19709802240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31504940544).

19709802240 is an abundant number, since it is smaller than the sum of its proper divisors (43300078848).

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

19709802240 is a wasteful number, since it uses less digits than its factorization.

19709802240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5054 (or 5040 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 19709802240 in words is "nineteen billion, seven hundred nine million, eight hundred two thousand, two hundred forty".