20656516 has 6 divisors (see below), whose sum is σ = 36148910. Its totient is φ = 10328256.

The previous prime is 20656511. The next prime is 20656523. The reversal of 20656516 is 61565602.

It can be written as a sum of positive squares in only one way, i.e., 18096516 + 2560000 = 4254^2 + 1600^2 .

It is not an unprimeable number, because it can be changed into a prime (20656511) 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 as a sum of consecutive naturals, namely, 2582061 + ... + 2582068.

Almost surely, 2^20656516 is an apocalyptic number.

It is an amenable number.

20656516 is a deficient number, since it is larger than the sum of its proper divisors (15492394).

20656516 is a wasteful number, since it uses less digits than its factorization.

20656516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5164133 (or 5164131 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 20656516 is about 4544.9440040555. The cubic root of 20656516 is about 274.3799407063.

The spelling of 20656516 in words is "twenty million, six hundred fifty-six thousand, five hundred sixteen".