20644041 has 32 divisors (see below), whose sum is σ = 31933440. Its totient is φ = 11739200.

The previous prime is 20644037. The next prime is 20644049. The reversal of 20644041 is 14044602.

It is not a de Polignac number, because 20644041 - 2² = 20644037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20643999 and 20644017.

It is not an unprimeable number, because it can be changed into a prime (20644049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44551 + ... + 45011.

It is an arithmetic number, because the mean of its divisors is an integer number (997920).

Almost surely, 2^20644041 is an apocalyptic number.

It is an amenable number.

20644041 is a deficient number, since it is larger than the sum of its proper divisors (11289399).

20644041 is a wasteful number, since it uses less digits than its factorization.

20644041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20644041 is about 4543.5713926382. The cubic root of 20644041 is about 274.3246945546.

Adding to 20644041 its reverse (14044602), we get a palindrome (34688643).

It can be divided in two parts, 2064 and 4041, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 20644041 in words is "twenty million, six hundred forty-four thousand, forty-one".