20728046 has 8 divisors (see below), whose sum is σ = 31113720. Its totient is φ = 10356808.

The previous prime is 20728033. The next prime is 20728061. The reversal of 20728046 is 64082702.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 1340 + ... + 6576.

It is an arithmetic number, because the mean of its divisors is an integer number (3889215).

Almost surely, 2^20728046 is an apocalyptic number.

20728046 is a deficient number, since it is larger than the sum of its proper divisors (10385674).

20728046 is a wasteful number, since it uses less digits than its factorization.

20728046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7218.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20728046 is about 4552.8063872737. The cubic root of 20728046 is about 274.6962861853.

The spelling of 20728046 in words is "twenty million, seven hundred twenty-eight thousand, forty-six".