20856360 has 96 divisors (see below), whose sum is σ = 72804960. Its totient is φ = 4765824.

The previous prime is 20856359. The next prime is 20856371. The reversal of 20856360 is 6365802.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4107 + ... + 7653.

It is an arithmetic number, because the mean of its divisors is an integer number (758385).

Almost surely, 2^20856360 is an apocalyptic number.

20856360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20856360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36402480).

20856360 is an abundant number, since it is smaller than the sum of its proper divisors (51948600).

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

20856360 is a wasteful number, since it uses less digits than its factorization.

20856360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3575 (or 3564 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20856360 is about 4566.8763942108. The cubic root of 20856360 is about 275.2619432518.

The spelling of 20856360 in words is "twenty million, eight hundred fifty-six thousand, three hundred sixty".