20723721733512 has 96 divisors (see below), whose sum is σ = 64152774017280. Its totient is φ = 5920332180480.

The previous prime is 20723721733499. The next prime is 20723721733523. The reversal of 20723721733512 is 21533712732702.

20723721733512 is a `hidden beast` number, since 2 + 0 + 7 + 23 + 72 + 17 + 33 + 512 = 666.

It is a super-2 number, since 2×20723721733512² (a number of 27 digits) contains 22 as substring.

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, 1553208 + ... + 6622680.

It is an arithmetic number, because the mean of its divisors is an integer number (668258062680).

Almost surely, 2^{20723721733512} is an apocalyptic number.

It is an amenable number.

20723721733512 is an abundant number, since it is smaller than the sum of its proper divisors (43429052283768).

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

20723721733512 is a wasteful number, since it uses less digits than its factorization.

20723721733512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077603 (or 5077596 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 45.

The spelling of 20723721733512 in words is "twenty trillion, seven hundred twenty-three billion, seven hundred twenty-one million, seven hundred thirty-three thousand, five hundred twelve".