20016645 has 16 divisors (see below), whose sum is σ = 34938432. Its totient is φ = 9704960.

The previous prime is 20016643. The next prime is 20016649. The reversal of 20016645 is 54661002.

It is not a de Polignac number, because 20016645 - 2¹ = 20016643 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20016643) 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, 60492 + ... + 60821.

It is an arithmetic number, because the mean of its divisors is an integer number (2183652).

Almost surely, 2^20016645 is an apocalyptic number.

It is an amenable number.

20016645 is a deficient number, since it is larger than the sum of its proper divisors (14921787).

20016645 is a wasteful number, since it uses less digits than its factorization.

20016645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121332.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20016645 is about 4473.9965355373. The cubic root of 20016645 is about 271.5170432477.

Adding to 20016645 its reverse (54661002), we get a palindrome (74677647).

It can be divided in two parts, 2001 and 6645, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 20016645 in words is "twenty million, sixteen thousand, six hundred forty-five".