20928330 has 48 divisors (see below), whose sum is σ = 54872064. Its totient is φ = 5533920.

The previous prime is 20928289. The next prime is 20928353. The reversal of 20928330 is 3382902.

It is a junction number, because it is equal to n+sod(n) for n = 20928294 and 20928303.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10515 + ... + 12345.

It is an arithmetic number, because the mean of its divisors is an integer number (1143168).

Almost surely, 2^20928330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20928330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27436032).

20928330 is an abundant number, since it is smaller than the sum of its proper divisors (33943734).

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

20928330 is a wasteful number, since it uses less digits than its factorization.

20928330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971 (or 1968 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20928330 is about 4574.7491734520. The cubic root of 20928330 is about 275.5781994365.

The spelling of 20928330 in words is "twenty million, nine hundred twenty-eight thousand, three hundred thirty".