20858841 has 12 divisors (see below), whose sum is σ = 30469140. Its totient is φ = 13749120.

The previous prime is 20858821. The next prime is 20858843. The reversal of 20858841 is 14885802.

It can be written as a sum of positive squares in 2 ways, for example, as 12425625 + 8433216 = 3525^2 + 2904^2 .

It is not a de Polignac number, because 20858841 - 2¹¹ = 20856793 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20858796 and 20858805.

It is not an unprimeable number, because it can be changed into a prime (20858843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12220 + ... + 13821.

It is an arithmetic number, because the mean of its divisors is an integer number (2539095).

Almost surely, 2^20858841 is an apocalyptic number.

It is an amenable number.

20858841 is a deficient number, since it is larger than the sum of its proper divisors (9610299).

20858841 is a wasteful number, since it uses less digits than its factorization.

20858841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26136 (or 26133 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 20858841 is about 4567.1480159942. The cubic root of 20858841 is about 275.2728575533.

It can be divided in two parts, 208 and 58841, that added together give a 10-th power (59049 = 3¹⁰).

The spelling of 20858841 in words is "twenty million, eight hundred fifty-eight thousand, eight hundred forty-one".