20916860 has 24 divisors (see below), whose sum is σ = 44126880. Its totient is φ = 8328384.

The previous prime is 20916829. The next prime is 20916871. The reversal of 20916860 is 6861902.

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, 2297 + ... + 6863.

It is an arithmetic number, because the mean of its divisors is an integer number (1838620).

Almost surely, 2^20916860 is an apocalyptic number.

20916860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20916860 is an abundant number, since it is smaller than the sum of its proper divisors (23210020).

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

20916860 is a wasteful number, since it uses less digits than its factorization.

20916860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4805 (or 4803 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 20916860 is about 4573.4953809969. The cubic root of 20916860 is about 275.5278456884.

The spelling of 20916860 in words is "twenty million, nine hundred sixteen thousand, eight hundred sixty".