20721741868996 has 243 divisors, whose sum is σ = 44978511657807. Its totient is φ = 8328183605280.

The previous prime is 20721741868939. The next prime is 20721741869009. The reversal of 20721741868996 is 69986814712702.

The square root of 20721741868996 is 4552114.

It is a perfect power (a square), and thus also a powerful number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 98207307331 + ... + 98207307541.

Almost surely, 2^{20721741868996} is an apocalyptic number.

20721741868996 is the 4552114-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20721741868996

20721741868996 is an abundant number, since it is smaller than the sum of its proper divisors (24256769788811).

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

20721741868996 is an equidigital number, since it uses as much as digits as its factorization.

20721741868996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 146313216, while the sum is 70.

The spelling of 20721741868996 in words is "twenty trillion, seven hundred twenty-one billion, seven hundred forty-one million, eight hundred sixty-eight thousand, nine hundred ninety-six".