20881212 has 72 divisors (see below), whose sum is σ = 54564048. Its totient is φ = 6209280.

The previous prime is 20881181. The next prime is 20881229. The reversal of 20881212 is 21218802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105898 + ... + 106094.

It is an arithmetic number, because the mean of its divisors is an integer number (757834).

Almost surely, 2^20881212 is an apocalyptic number.

20881212 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 20881212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27282024).

20881212 is an abundant number, since it is smaller than the sum of its proper divisors (33682836).

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

20881212 is a wasteful number, since it uses less digits than its factorization.

20881212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 20881212 is about 4569.5964810911. The cubic root of 20881212 is about 275.3712319690.

The spelling of 20881212 in words is "twenty million, eight hundred eighty-one thousand, two hundred twelve".