19701323440 has 160 divisors (see below), whose sum is σ = 50448199680. Its totient is φ = 7121968128.

The previous prime is 19701323393. The next prime is 19701323441. The reversal of 19701323440 is 4432310791.

It is a junction number, because it is equal to n+sod(n) for n = 19701323396 and 19701323405.

It is not an unprimeable number, because it can be changed into a prime (19701323441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22828449 + ... + 22829311.

It is an arithmetic number, because the mean of its divisors is an integer number (315301248).

Almost surely, 2^19701323440 is an apocalyptic number.

19701323440 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 19701323440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25224099840).

19701323440 is an abundant number, since it is smaller than the sum of its proper divisors (30746876240).

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

19701323440 is a wasteful number, since it uses less digits than its factorization.

19701323440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571 (or 1565 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 19701323440 in words is "nineteen billion, seven hundred one million, three hundred twenty-three thousand, four hundred forty".