20220636 has 48 divisors (see below), whose sum is σ = 50117760. Its totient is φ = 6327360.

The previous prime is 20220631. The next prime is 20220637. The reversal of 20220636 is 63602202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29530 + ... + 30206.

It is an arithmetic number, because the mean of its divisors is an integer number (1044120).

Almost surely, 2^20220636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20220636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25058880).

20220636 is an abundant number, since it is smaller than the sum of its proper divisors (29897124).

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

20220636 is a wasteful number, since it uses less digits than its factorization.

20220636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834 (or 832 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20220636 is about 4496.7361496979. The cubic root of 20220636 is about 272.4362772190.

Adding to 20220636 its reverse (63602202), we get a palindrome (83822838).

The spelling of 20220636 in words is "twenty million, two hundred twenty thousand, six hundred thirty-six".