20748756 has 72 divisors (see below), whose sum is σ = 57265600. Its totient is φ = 5844720.

The previous prime is 20748751. The next prime is 20748757. The reversal of 20748756 is 65784702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20748751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 292201 + ... + 292271.

Almost surely, 2^20748756 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 20748756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28632800).

20748756 is an abundant number, since it is smaller than the sum of its proper divisors (36516844).

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

20748756 is an equidigital number, since it uses as much as digits as its factorization.

20748756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 20748756 is about 4555.0802407861. The cubic root of 20748756 is about 274.7877414447.

The spelling of 20748756 in words is "twenty million, seven hundred forty-eight thousand, seven hundred fifty-six".