20620616 has 16 divisors (see below), whose sum is σ = 38729340. Its totient is φ = 10292800.

The previous prime is 20620597. The next prime is 20620619. The reversal of 20620616 is 61602602.

It can be written as a sum of positive squares in 2 ways, for example, as 18028516 + 2592100 = 4246^2 + 1610^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20620591 and 20620600.

It is not an unprimeable number, because it can be changed into a prime (20620619) 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 3 ways as a sum of consecutive naturals, for example, 3770 + ... + 7446.

Almost surely, 2^20620616 is an apocalyptic number.

It is an amenable number.

20620616 is a deficient number, since it is larger than the sum of its proper divisors (18108724).

20620616 is a wasteful number, since it uses less digits than its factorization.

20620616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4384 (or 4380 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20620616 is about 4540.9928429805. The cubic root of 20620616 is about 274.2208956250.

The spelling of 20620616 in words is "twenty million, six hundred twenty thousand, six hundred sixteen".