20828660 has 24 divisors (see below), whose sum is σ = 44169216. Its totient is φ = 8249760.

The previous prime is 20828659. The next prime is 20828671. The reversal of 20828660 is 6682802.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2996 + ... + 7115.

It is an arithmetic number, because the mean of its divisors is an integer number (1840384).

Almost surely, 2^20828660 is an apocalyptic number.

20828660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20828660 is an abundant number, since it is smaller than the sum of its proper divisors (23340556).

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

20828660 is a wasteful number, since it uses less digits than its factorization.

20828660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10223 (or 10221 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 20828660 is about 4563.8426791466. The cubic root of 20828660 is about 275.1400278604.

The spelling of 20828660 in words is "twenty million, eight hundred twenty-eight thousand, six hundred sixty".