20001963996 has 72 divisors (see below), whose sum is σ = 57912472800. Its totient is φ = 5702086656.

The previous prime is 20001963953. The next prime is 20001964019. The reversal of 20001963996 is 69936910002.

It is a happy number.

20001963996 is a `hidden beast` number, since 2 + 0 + 0 + 0 + 1 + 9 + 639 + 9 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24760 + ... + 201536.

It is an arithmetic number, because the mean of its divisors is an integer number (804339900).

Almost surely, 2^20001963996 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 20001963996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28956236400).

20001963996 is an abundant number, since it is smaller than the sum of its proper divisors (37910508804).

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

20001963996 is a wasteful number, since it uses less digits than its factorization.

20001963996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177243 (or 177238 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The spelling of 20001963996 in words is "twenty billion, one million, nine hundred sixty-three thousand, nine hundred ninety-six".