20113212 has 48 divisors (see below), whose sum is σ = 54028800. Its totient is φ = 5704512.

The previous prime is 20113189. The next prime is 20113213. The reversal of 20113212 is 21231102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113213) 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, 11713 + ... + 13319.

It is an arithmetic number, because the mean of its divisors is an integer number (1125600).

Almost surely, 2^20113212 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 20113212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27014400).

20113212 is an abundant number, since it is smaller than the sum of its proper divisors (33915588).

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

20113212 is a wasteful number, since it uses less digits than its factorization.

20113212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770 (or 1768 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20113212 is about 4484.7755796695. The cubic root of 20113212 is about 271.9529726944.

Adding to 20113212 its reverse (21231102), we get a palindrome (41344314).

The spelling of 20113212 in words is "twenty million, one hundred thirteen thousand, two hundred twelve".