20890841 has 8 divisors (see below), whose sum is σ = 22176360. Its totient is φ = 19611648.

The previous prime is 20890813. The next prime is 20890867. The reversal of 20890841 is 14809802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3916441 + 16974400 = 1979^2 + 4120^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20890841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20890798 and 20890807.

It is not an unprimeable number, because it can be changed into a prime (20890811) 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, 6425 + ... + 9113.

It is an arithmetic number, because the mean of its divisors is an integer number (2772045).

Almost surely, 2^20890841 is an apocalyptic number.

It is an amenable number.

20890841 is a deficient number, since it is larger than the sum of its proper divisors (1285519).

20890841 is a wasteful number, since it uses less digits than its factorization.

20890841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3163.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20890841 is about 4570.6499537812. The cubic root of 20890841 is about 275.4135529819.

The spelling of 20890841 in words is "twenty million, eight hundred ninety thousand, eight hundred forty-one".