20847736 has 48 divisors (see below), whose sum is σ = 48981240. Its totient is φ = 8245440.

The previous prime is 20847727. The next prime is 20847737. The reversal of 20847736 is 63774802.

It is a junction number, because it is equal to n+sod(n) for n = 20847695 and 20847704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20847737) 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, 3051 + ... + 7141.

Almost surely, 2^20847736 is an apocalyptic number.

20847736 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20847736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24490620).

20847736 is an abundant number, since it is smaller than the sum of its proper divisors (28133504).

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

20847736 is a wasteful number, since it uses less digits than its factorization.

20847736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124 (or 4113 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 20847736 is about 4565.9321063721. The cubic root of 20847736 is about 275.2239982114.

The spelling of 20847736 in words is "twenty million, eight hundred forty-seven thousand, seven hundred thirty-six".