11981208020 has 12 divisors (see below), whose sum is σ = 25160536884. Its totient is φ = 4792483200.

The previous prime is 11981207989. The next prime is 11981208059. The reversal of 11981208020 is 2080218911.

It can be written as a sum of positive squares in 2 ways, for example, as 9295273744 + 2685934276 = 96412^2 + 51826^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299530181 + ... + 299530220.

It is an arithmetic number, because the mean of its divisors is an integer number (2096711407).

Almost surely, 2^11981208020 is an apocalyptic number.

11981208020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11981208020 is an abundant number, since it is smaller than the sum of its proper divisors (13179328864).

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

11981208020 is a wasteful number, since it uses less digits than its factorization.

11981208020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599060410 (or 599060408 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 11981208020 in words is "eleven billion, nine hundred eighty-one million, two hundred eight thousand, twenty".