19720720206 has 96 divisors (see below), whose sum is σ = 47973264768. Its totient is φ = 5802217920.

The previous prime is 19720720193. The next prime is 19720720211. The reversal of 19720720206 is 60202702791.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3828925 + ... + 3834071.

It is an arithmetic number, because the mean of its divisors is an integer number (499721508).

Almost surely, 2^19720720206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19720720206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23986632384).

19720720206 is an abundant number, since it is smaller than the sum of its proper divisors (28252544562).

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

19720720206 is a wasteful number, since it uses less digits than its factorization.

19720720206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5726 (or 5723 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The spelling of 19720720206 in words is "nineteen billion, seven hundred twenty million, seven hundred twenty thousand, two hundred six".