20199723648 has 192 divisors, whose sum is σ = 58663504800. Its totient is φ = 6155096064.

The previous prime is 20199723647. The next prime is 20199723653. The reversal of 20199723648 is 84632799102.

It is a tau number, because it is divible by the number of its divisors (192).

It is a self number, because there is not a number n which added to its sum of digits gives 20199723648.

It is not an unprimeable number, because it can be changed into a prime (20199723647) 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, 6942418 + ... + 6945326.

Almost surely, 2^20199723648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20199723648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29331752400).

20199723648 is an abundant number, since it is smaller than the sum of its proper divisors (38463781152).

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

20199723648 is a wasteful number, since it uses less digits than its factorization.

20199723648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3059 (or 3034 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 20199723648 in words is "twenty billion, one hundred ninety-nine million, seven hundred twenty-three thousand, six hundred forty-eight".