20216536 has 32 divisors (see below), whose sum is σ = 41081040. Its totient is φ = 9289728.

The previous prime is 20216507. The next prime is 20216569. The reversal of 20216536 is 63561202.

It is a self number, because there is not a number n which added to its sum of digits gives 20216536.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4120 + ... + 7576.

Almost surely, 2^20216536 is an apocalyptic number.

It is an amenable number.

20216536 is an abundant number, since it is smaller than the sum of its proper divisors (20864504).

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

20216536 is a wasteful number, since it uses less digits than its factorization.

20216536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3523 (or 3519 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20216536 is about 4496.2802403765. The cubic root of 20216536 is about 272.4178626277.

Adding to 20216536 its reverse (63561202), we get a palindrome (83777738).

The spelling of 20216536 in words is "twenty million, two hundred sixteen thousand, five hundred thirty-six".