19802063808 has 168 divisors, whose sum is σ = 59376564000. Its totient is φ = 6297747456.

The previous prime is 19802063803. The next prime is 19802063833. The reversal of 19802063808 is 80836020891.

19802063808 is a `hidden beast` number, since 1 + 9 + 8 + 0 + 2 + 0 + 638 + 0 + 8 = 666.

It is a super-2 number, since 2×19802063808² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19802063803) 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, 5946688 + ... + 5950016.

Almost surely, 2^19802063808 is an apocalyptic number.

19802063808 is a gapful number since it is divisible by the number (18) 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 19802063808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29688282000).

19802063808 is an abundant number, since it is smaller than the sum of its proper divisors (39574500192).

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

19802063808 is a wasteful number, since it uses less digits than its factorization.

19802063808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3819 (or 3806 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 19802063808 in words is "nineteen billion, eight hundred two million, sixty-three thousand, eight hundred eight".