20928306 has 32 divisors (see below), whose sum is σ = 48117888. Its totient is φ = 5944320.

The previous prime is 20928289. The next prime is 20928353. The reversal of 20928306 is 60382902.

20928306 = 246² + 247² + ... + 426².

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6226 + ... + 8978.

It is an arithmetic number, because the mean of its divisors is an integer number (1503684).

Almost surely, 2^20928306 is an apocalyptic number.

20928306 is an abundant number, since it is smaller than the sum of its proper divisors (27189582).

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

20928306 is a wasteful number, since it uses less digits than its factorization.

20928306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20928306 is about 4574.7465503566. The cubic root of 20928306 is about 275.5780940948.

The spelling of 20928306 in words is "twenty million, nine hundred twenty-eight thousand, three hundred six".