20199681612 has 96 divisors (see below), whose sum is σ = 57313992960. Its totient is φ = 6101447040.

The previous prime is 20199681563. The next prime is 20199681647. The reversal of 20199681612 is 21618699102.

20199681612 is a `hidden beast` number, since 20 + 1 + 9 + 9 + 6 + 8 + 1 + 612 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 344683 + ... + 399005.

It is an arithmetic number, because the mean of its divisors is an integer number (597020760).

Almost surely, 2^20199681612 is an apocalyptic number.

20199681612 is a gapful number since it is divisible by the number (22) 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 20199681612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28656996480).

20199681612 is an abundant number, since it is smaller than the sum of its proper divisors (37114311348).

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

20199681612 is a wasteful number, since it uses less digits than its factorization.

20199681612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54660 (or 54652 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 20199681612 in words is "twenty billion, one hundred ninety-nine million, six hundred eighty-one thousand, six hundred twelve".