20481616 has 10 divisors (see below), whose sum is σ = 39683162. Its totient is φ = 10240800.

The previous prime is 20481599. The next prime is 20481623. The reversal of 20481616 is 61618402.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 5271616 = 3900^2 + 2296^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640035 + ... + 640066.

Almost surely, 2^20481616 is an apocalyptic number.

It is an amenable number.

20481616 is a deficient number, since it is larger than the sum of its proper divisors (19201546).

20481616 is a wasteful number, since it uses less digits than its factorization.

20481616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280109 (or 1280103 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20481616 is about 4525.6619405342. The cubic root of 20481616 is about 273.6033474278.

It can be divided in two parts, 20 and 481616, that added together give a square (481636 = 694²).

The spelling of 20481616 in words is "twenty million, four hundred eighty-one thousand, six hundred sixteen".