20943320 has 64 divisors (see below), whose sum is σ = 52552800. Its totient is φ = 7464960.

The previous prime is 20943319. The next prime is 20943323. The reversal of 20943320 is 2334902.

20943320 = T₄₅ + T₄₆ + ... + T₅₀₀.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20943323) 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, 12110 + ... + 13730.

Almost surely, 2^20943320 is an apocalyptic number.

20943320 is a gapful number since it is divisible by the number (20) 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 20943320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26276400).

20943320 is an abundant number, since it is smaller than the sum of its proper divisors (31609480).

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

20943320 is a wasteful number, since it uses less digits than its factorization.

20943320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668 (or 1664 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20943320 is about 4576.3872213789. The cubic root of 20943320 is about 275.6439783964.

The spelling of 20943320 in words is "twenty million, nine hundred forty-three thousand, three hundred twenty".