20730726 has 24 divisors (see below), whose sum is σ = 45017544. Its totient is φ = 6894720.

The previous prime is 20730719. The next prime is 20730733. The reversal of 20730726 is 62703702.

It is an interprime number because it is at equal distance from previous prime (20730719) and next prime (20730733).

It is a self number, because there is not a number n which added to its sum of digits gives 20730726.

It is a congruent number.

It is an unprimeable number.

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, 9270 + ... + 11286.

It is an arithmetic number, because the mean of its divisors is an integer number (1875731).

Almost surely, 2^20730726 is an apocalyptic number.

20730726 is an abundant number, since it is smaller than the sum of its proper divisors (24286818).

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

20730726 is a wasteful number, since it uses less digits than its factorization.

20730726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596 (or 2593 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 20730726 is about 4553.1007017197. The cubic root of 20730726 is about 274.7081244828.

The spelling of 20730726 in words is "twenty million, seven hundred thirty thousand, seven hundred twenty-six".