20811458 has 16 divisors (see below), whose sum is σ = 32676480. Its totient is φ = 9922176.

The previous prime is 20811433. The next prime is 20811463. The reversal of 20811458 is 85411802.

It is a self number, because there is not a number n which added to its sum of digits gives 20811458.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21938 + ... + 22866.

It is an arithmetic number, because the mean of its divisors is an integer number (2042280).

Almost surely, 2^20811458 is an apocalyptic number.

20811458 is a deficient number, since it is larger than the sum of its proper divisors (11865022).

20811458 is a wasteful number, since it uses less digits than its factorization.

20811458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 20811458 is about 4561.9576937977. The cubic root of 20811458 is about 275.0642626677.

The spelling of 20811458 in words is "twenty million, eight hundred eleven thousand, four hundred fifty-eight".