20040616 has 8 divisors (see below), whose sum is σ = 37576170. Its totient is φ = 10020304.

The previous prime is 20040583. The next prime is 20040619. The reversal of 20040616 is 61604002.

It can be written as a sum of positive squares in only one way, i.e., 19838116 + 202500 = 4454^2 + 450^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20040593 and 20040602.

It is not an unprimeable number, because it can be changed into a prime (20040619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252531 + ... + 1252546.

Almost surely, 2^20040616 is an apocalyptic number.

It is an amenable number.

20040616 is a deficient number, since it is larger than the sum of its proper divisors (17535554).

20040616 is a wasteful number, since it uses less digits than its factorization.

20040616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505083 (or 2505079 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20040616 is about 4476.6746587171. The cubic root of 20040616 is about 271.6253853910.

Adding to 20040616 its reverse (61604002), we get a palindrome (81644618).

The spelling of 20040616 in words is "twenty million, forty thousand, six hundred sixteen".