20616686 has 16 divisors (see below), whose sum is σ = 31999968. Its totient is φ = 9955200.

The previous prime is 20616677. The next prime is 20616697. The reversal of 20616686 is 68661602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7226 + ... + 9666.

It is an arithmetic number, because the mean of its divisors is an integer number (1999998).

Almost surely, 2^20616686 is an apocalyptic number.

20616686 is a deficient number, since it is larger than the sum of its proper divisors (11383282).

20616686 is a wasteful number, since it uses less digits than its factorization.

20616686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 20616686 is about 4540.5600976091. The cubic root of 20616686 is about 274.2034736335.

It can be divided in two parts, 206 and 16686, that multiplied together give a square (3437316 = 1854²).

The spelling of 20616686 in words is "twenty million, six hundred sixteen thousand, six hundred eighty-six".