20828860 has 24 divisors (see below), whose sum is σ = 47105856. Its totient is φ = 7690560.

The previous prime is 20828851. The next prime is 20828867. The reversal of 20828860 is 6882802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20828867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39796 + ... + 40315.

It is an arithmetic number, because the mean of its divisors is an integer number (1962744).

Almost surely, 2^20828860 is an apocalyptic number.

20828860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20828860 is an abundant number, since it is smaller than the sum of its proper divisors (26276996).

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

20828860 is a wasteful number, since it uses less digits than its factorization.

20828860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80133 (or 80131 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 20828860 is about 4563.8645904540. The cubic root of 20828860 is about 275.1409085032.

The spelling of 20828860 in words is "twenty million, eight hundred twenty-eight thousand, eight hundred sixty".