20986212 has 48 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 6175488.

The previous prime is 20986181. The next prime is 20986237. The reversal of 20986212 is 21268902.

It is a self number, because there is not a number n which added to its sum of digits gives 20986212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 664 + ... + 6512.

It is an arithmetic number, because the mean of its divisors is an integer number (1146600).

Almost surely, 2^20986212 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 20986212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27518400).

20986212 is an abundant number, since it is smaller than the sum of its proper divisors (34050588).

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

20986212 is a wasteful number, since it uses less digits than its factorization.

20986212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5892 (or 5890 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20986212 is about 4581.0710538039. The cubic root of 20986212 is about 275.8320233922.

The spelling of 20986212 in words is "twenty million, nine hundred eighty-six thousand, two hundred twelve".