20216916 has 36 divisors (see below), whose sum is σ = 51460500. Its totient is φ = 6691968.

The previous prime is 20216869. The next prime is 20216921. The reversal of 20216916 is 61961202.

It can be written as a sum of positive squares in 2 ways, for example, as 9326916 + 10890000 = 3054^2 + 3300^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20216916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3480 + ... + 7248.

Almost surely, 2^20216916 is an apocalyptic number.

It is an amenable number.

20216916 is an abundant number, since it is smaller than the sum of its proper divisors (31243584).

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

20216916 is a wasteful number, since it uses less digits than its factorization.

20216916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928 (or 3923 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20216916 is about 4496.3224973305. The cubic root of 20216916 is about 272.4195694506.

The spelling of 20216916 in words is "twenty million, two hundred sixteen thousand, nine hundred sixteen".