20728367 has 16 divisors (see below), whose sum is σ = 23639040. Its totient is φ = 18004800.

The previous prime is 20728339. The next prime is 20728387. The reversal of 20728367 is 76382702.

It is not a de Polignac number, because 20728367 - 2²⁴ = 3951151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20728387) 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 15 ways as a sum of consecutive naturals, for example, 30008 + ... + 30690.

It is an arithmetic number, because the mean of its divisors is an integer number (1477440).

Almost surely, 2^20728367 is an apocalyptic number.

20728367 is a deficient number, since it is larger than the sum of its proper divisors (2910673).

20728367 is a wasteful number, since it uses less digits than its factorization.

20728367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 20728367 is about 4552.8416401188. The cubic root of 20728367 is about 274.6977041845.

The spelling of 20728367 in words is "twenty million, seven hundred twenty-eight thousand, three hundred sixty-seven".