20986443 has 12 divisors (see below), whose sum is σ = 30381000. Its totient is φ = 13959936.

The previous prime is 20986439. The next prime is 20986447. The reversal of 20986443 is 34468902.

It is a happy number.

20986443 is a `hidden beast` number, since 2 + 0 + 9 + 8 + 644 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (20986439) and next prime (20986447).

It is not a de Polignac number, because 20986443 - 2² = 20986439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20986398 and 20986407.

It is not an unprimeable number, because it can be changed into a prime (20986447) 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, 2155 + ... + 6827.

It is an arithmetic number, because the mean of its divisors is an integer number (2531750).

Almost surely, 2^20986443 is an apocalyptic number.

20986443 is a deficient number, since it is larger than the sum of its proper divisors (9394557).

20986443 is a wasteful number, since it uses less digits than its factorization.

20986443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5178 (or 5175 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20986443 is about 4581.0962661791. The cubic root of 20986443 is about 275.8330354371.

The spelling of 20986443 in words is "twenty million, nine hundred eighty-six thousand, four hundred forty-three".