20747736 has 48 divisors (see below), whose sum is σ = 56659200. Its totient is φ = 6858432.

The previous prime is 20747729. The next prime is 20747737. The reversal of 20747736 is 63774702.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20747736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747737) 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 11 ways as a sum of consecutive naturals, for example, 8010 + ... + 10278.

It is an arithmetic number, because the mean of its divisors is an integer number (1180400).

Almost surely, 2^20747736 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 20747736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28329600).

20747736 is an abundant number, since it is smaller than the sum of its proper divisors (35911464).

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

20747736 is a wasteful number, since it uses less digits than its factorization.

20747736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408 (or 2401 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 36.

The square root of 20747736 is about 4554.9682765086. The cubic root of 20747736 is about 274.7832385548.

The spelling of 20747736 in words is "twenty million, seven hundred forty-seven thousand, seven hundred thirty-six".