20740736 has 32 divisors (see below), whose sum is σ = 42660480. Its totient is φ = 10033920.

The previous prime is 20740729. The next prime is 20740747. The reversal of 20740736 is 63704702.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 20740699 and 20740708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (1333140).

Almost surely, 2^20740736 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 20740736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21330240).

20740736 is an abundant number, since it is smaller than the sum of its proper divisors (21919744).

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

20740736 is an equidigital number, since it uses as much as digits as its factorization.

20740736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272 (or 5260 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 20740736 is about 4554.1998199464. The cubic root of 20740736 is about 274.7523323871.

The spelling of 20740736 in words is "twenty million, seven hundred forty thousand, seven hundred thirty-six".