20856086 has 8 divisors (see below), whose sum is σ = 32129760. Its totient is φ = 10146168.

The previous prime is 20856061. The next prime is 20856089. The reversal of 20856086 is 68065802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×20856086³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20856089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140846 + ... + 140993.

It is an arithmetic number, because the mean of its divisors is an integer number (4016220).

Almost surely, 2^20856086 is an apocalyptic number.

20856086 is a deficient number, since it is larger than the sum of its proper divisors (11273674).

20856086 is a wasteful number, since it uses less digits than its factorization.

20856086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281878.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 20856086 is about 4566.8463954900. The cubic root of 20856086 is about 275.2607378305.

The spelling of 20856086 in words is "twenty million, eight hundred fifty-six thousand, eighty-six".