20728874 has 8 divisors (see below), whose sum is σ = 31112640. Its totient is φ = 10357996.

The previous prime is 20728859. The next prime is 20728891. The reversal of 20728874 is 47882702.

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

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 4577 + ... + 7899.

It is an arithmetic number, because the mean of its divisors is an integer number (3889080).

Almost surely, 2^20728874 is an apocalyptic number.

20728874 is a deficient number, since it is larger than the sum of its proper divisors (10383766).

20728874 is a wasteful number, since it uses less digits than its factorization.

20728874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6444.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 20728874 is about 4552.8973192902. The cubic root of 20728874 is about 274.6999437981.

The spelling of 20728874 in words is "twenty million, seven hundred twenty-eight thousand, eight hundred seventy-four".