20307749445756 has 72 divisors (see below), whose sum is σ = 52046121529584. Its totient is φ = 6675308478720.

The previous prime is 20307749445713. The next prime is 20307749445757. The reversal of 20307749445756 is 65754494770302.

20307749445756 is a `hidden beast` number, since 2 + 0 + 3 + 0 + 77 + 494 + 4 + 5 + 75 + 6 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20307749445693 and 20307749445702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20307749445757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13836910 + ... + 15234026.

It is an arithmetic number, because the mean of its divisors is an integer number (722862799022).

Almost surely, 2^{20307749445756} 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 20307749445756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26023060764792).

20307749445756 is an abundant number, since it is smaller than the sum of its proper divisors (31738372083828).

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

20307749445756 is a wasteful number, since it uses less digits than its factorization.

20307749445756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402731 (or 1402726 counting only the distinct ones).

The product of its (nonzero) digits is 177811200, while the sum is 63.

The spelling of 20307749445756 in words is "twenty trillion, three hundred seven billion, seven hundred forty-nine million, four hundred forty-five thousand, seven hundred fifty-six".