20616646 has 8 divisors (see below), whose sum is σ = 31085784. Its totient is φ = 10254720.

The previous prime is 20616623. The next prime is 20616647. The reversal of 20616646 is 64661602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20616647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26320 + ... + 27091.

It is an arithmetic number, because the mean of its divisors is an integer number (3885723).

Almost surely, 2^20616646 is an apocalyptic number.

20616646 is a deficient number, since it is larger than the sum of its proper divisors (10469138).

20616646 is a wasteful number, since it uses less digits than its factorization.

20616646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53606.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 20616646 is about 4540.5556928640. Note that the first 3 decimals coincide. The cubic root of 20616646 is about 274.2032962991.

The spelling of 20616646 in words is "twenty million, six hundred sixteen thousand, six hundred forty-six".