20891082 has 8 divisors (see below), whose sum is σ = 41782176. Its totient is φ = 6963692.

The previous prime is 20891081. The next prime is 20891083. The reversal of 20891082 is 28019802.

It is an interprime number because it is at equal distance from previous prime (20891081) and next prime (20891083).

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

20891082 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20891081) 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, 1740918 + ... + 1740929.

It is an arithmetic number, because the mean of its divisors is an integer number (5222772).

Almost surely, 2^20891082 is an apocalyptic number.

20891082 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20891082 is a wasteful number, since it uses less digits than its factorization.

20891082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481852.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 20891082 is about 4570.6763175705. The cubic root of 20891082 is about 275.4146120490.

The spelling of 20891082 in words is "twenty million, eight hundred ninety-one thousand, eighty-two".