20646041 has 16 divisors (see below), whose sum is σ = 23796864. Its totient is φ = 17743104.

The previous prime is 20646029. The next prime is 20646049. The reversal of 20646041 is 14064602.

20646041 = T₁₅₅₀ + T₁₅₅₁ + ... + T₁₅₆₆.

It is a happy number.

It is not a de Polignac number, because 20646041 - 2¹⁴ = 20629657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20645998 and 20646016.

It is not an unprimeable number, because it can be changed into a prime (20646049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22310 + ... + 23216.

It is an arithmetic number, because the mean of its divisors is an integer number (1487304).

Almost surely, 2^20646041 is an apocalyptic number.

It is an amenable number.

20646041 is a deficient number, since it is larger than the sum of its proper divisors (3150823).

20646041 is a wasteful number, since it uses less digits than its factorization.

20646041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20646041 is about 4543.7914784902. The cubic root of 20646041 is about 274.3335531508. Note that the first 3 decimals are identical.

The spelling of 20646041 in words is "twenty million, six hundred forty-six thousand, forty-one".