20966220 has 72 divisors (see below), whose sum is σ = 69385680. Its totient is φ = 5082240.

The previous prime is 20966213. The next prime is 20966227. The reversal of 20966220 is 2266902.

It is an interprime number because it is at equal distance from previous prime (20966213) and next prime (20966227).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20966227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3315 + ... + 7274.

It is an arithmetic number, because the mean of its divisors is an integer number (963690).

Almost surely, 2^20966220 is an apocalyptic number.

20966220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20966220 is an abundant number, since it is smaller than the sum of its proper divisors (48419460).

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

20966220 is a wasteful number, since it uses less digits than its factorization.

20966220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615 (or 10610 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20966220 is about 4578.8885114185. Note that the first 3 decimals coincide. The cubic root of 20966220 is about 275.7444073612.

The spelling of 20966220 in words is "twenty million, nine hundred sixty-six thousand, two hundred twenty".