20854066 has 4 divisors (see below), whose sum is σ = 31281102. Its totient is φ = 10427032.

The previous prime is 20854063. The next prime is 20854073. The reversal of 20854066 is 66045802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66045802 = 2 ⋅33022901.

It can be written as a sum of positive squares in only one way, i.e., 20511841 + 342225 = 4529^2 + 585^2 .

It is not an unprimeable number, because it can be changed into a prime (20854061) by changing a digit.

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 as a sum of consecutive naturals, namely, 5213515 + ... + 5213518.

Almost surely, 2^20854066 is an apocalyptic number.

20854066 is a deficient number, since it is larger than the sum of its proper divisors (10427036).

20854066 is a wasteful number, since it uses less digits than its factorization.

20854066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10427035.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 20854066 is about 4566.6252309556. The cubic root of 20854066 is about 275.2518508220.

Adding to 20854066 its reverse (66045802), we get a palindrome (86899868).

The spelling of 20854066 in words is "twenty million, eight hundred fifty-four thousand, sixty-six".