20111872 has 40 divisors (see below), whose sum is σ = 43849872. Its totient is φ = 9139200.

The previous prime is 20111869. The next prime is 20111879. The reversal of 20111872 is 27811102.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20111879) 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, 3847 + ... + 7417.

Almost surely, 2^20111872 is an apocalyptic number.

20111872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21924936).

20111872 is an abundant number, since it is smaller than the sum of its proper divisors (23738000).

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

20111872 is an equidigital number, since it uses as much as digits as its factorization.

20111872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600 (or 3584 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 20111872 is about 4484.6261828607. The cubic root of 20111872 is about 271.9469331307.

Adding to 20111872 its reverse (27811102), we get a palindrome (47922974).

It can be divided in two parts, 2011 and 1872, that added together give a palindrome (3883).

The spelling of 20111872 in words is "twenty million, one hundred eleven thousand, eight hundred seventy-two".