20211136 has 56 divisors (see below), whose sum is σ = 46085760. Its totient is φ = 8697600.

The previous prime is 20211131. The next prime is 20211157. The reversal of 20211136 is 63111202.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12621 + ... + 14131.

It is an arithmetic number, because the mean of its divisors is an integer number (822960).

Almost surely, 2^20211136 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 20211136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23042880).

20211136 is an abundant number, since it is smaller than the sum of its proper divisors (25874624).

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

20211136 is a wasteful number, since it uses less digits than its factorization.

20211136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553 (or 1543 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20211136 is about 4495.6797038935. The cubic root of 20211136 is about 272.3936054643.

Adding to 20211136 its reverse (63111202), we get a palindrome (83322338).

The spelling of 20211136 in words is "twenty million, two hundred eleven thousand, one hundred thirty-six".