20407616 has 28 divisors (see below), whose sum is σ = 42880788. Its totient is φ = 9603072.

The previous prime is 20407613. The next prime is 20407631. The reversal of 20407616 is 61670402.

It can be written as a sum of positive squares in 2 ways, for example, as 14137600 + 6270016 = 3760^2 + 2504^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20407613) 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, 8291 + ... + 10466.

Almost surely, 2^20407616 is an apocalyptic number.

It is an amenable number.

20407616 is an abundant number, since it is smaller than the sum of its proper divisors (22473172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20407616 is a wasteful number, since it uses less digits than its factorization.

20407616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18786 (or 18776 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20407616 is about 4517.4789429504. The cubic root of 20407616 is about 273.2734405093.

The spelling of 20407616 in words is "twenty million, four hundred seven thousand, six hundred sixteen".