20216516 has 6 divisors (see below), whose sum is σ = 35378910. Its totient is φ = 10108256.

The previous prime is 20216507. The next prime is 20216569. The reversal of 20216516 is 61561202.

It can be written as a sum of positive squares in only one way, i.e., 20214016 + 2500 = 4496^2 + 50^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20216491 and 20216500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2527061 + ... + 2527068.

It is an arithmetic number, because the mean of its divisors is an integer number (5896485).

Almost surely, 2^20216516 is an apocalyptic number.

It is an amenable number.

20216516 is a deficient number, since it is larger than the sum of its proper divisors (15162394).

20216516 is a wasteful number, since it uses less digits than its factorization.

20216516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5054133 (or 5054131 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20216516 is about 4496.2780163153. The cubic root of 20216516 is about 272.4177727944.

Adding to 20216516 its reverse (61561202), we get a palindrome (81777718).

The spelling of 20216516 in words is "twenty million, two hundred sixteen thousand, five hundred sixteen".