20216636 has 12 divisors (see below), whose sum is σ = 38595480. Its totient is φ = 9189360.

The previous prime is 20216633. The next prime is 20216639. The reversal of 20216636 is 63661202.

It is an interprime number because it is at equal distance from previous prime (20216633) and next prime (20216639).

It is a super-3 number, since 3×20216636³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20216633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229691 + ... + 229778.

It is an arithmetic number, because the mean of its divisors is an integer number (3216290).

Almost surely, 2^20216636 is an apocalyptic number.

It is an amenable number.

20216636 is a deficient number, since it is larger than the sum of its proper divisors (18378844).

20216636 is a wasteful number, since it uses less digits than its factorization.

20216636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459484 (or 459482 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20216636 is about 4496.2913606660. The cubic root of 20216636 is about 272.4183117937.

Adding to 20216636 its reverse (63661202), we get a palindrome (83877838).

It can be divided in two parts, 202166 and 36, that added together give a palindrome (202202).

The spelling of 20216636 in words is "twenty million, two hundred sixteen thousand, six hundred thirty-six".