20730336 has 96 divisors (see below), whose sum is σ = 60455808. Its totient is φ = 6167040.

The previous prime is 20730313. The next prime is 20730373. The reversal of 20730336 is 63303702.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 70606 + ... + 70898.

It is an arithmetic number, because the mean of its divisors is an integer number (629748).

Almost surely, 2^20730336 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 20730336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30227904).

20730336 is an abundant number, since it is smaller than the sum of its proper divisors (39725472).

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

20730336 is a wasteful number, since it uses less digits than its factorization.

20730336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 24.

The square root of 20730336 is about 4553.0578735615. The cubic root of 20730336 is about 274.7064018089.

The spelling of 20730336 in words is "twenty million, seven hundred thirty thousand, three hundred thirty-six".