20016644 has 12 divisors (see below), whose sum is σ = 35112000. Its totient is φ = 9984648.

The previous prime is 20016643. The next prime is 20016649. The reversal of 20016644 is 44661002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20016643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3944 + ... + 7455.

It is an arithmetic number, because the mean of its divisors is an integer number (2926000).

Almost surely, 2^20016644 is an apocalyptic number.

It is an amenable number.

20016644 is a deficient number, since it is larger than the sum of its proper divisors (15095356).

20016644 is a wasteful number, since it uses less digits than its factorization.

20016644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11842 (or 11840 counting only the distinct ones).

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

The square root of 20016644 is about 4473.9964237804. The cubic root of 20016644 is about 271.5170387262.

Adding to 20016644 its reverse (44661002), we get a palindrome (64677646).

The spelling of 20016644 in words is "twenty million, sixteen thousand, six hundred forty-four".