20943456 has 96 divisors (see below), whose sum is σ = 59820768. Its totient is φ = 6389760.

The previous prime is 20943449. The next prime is 20943457. The reversal of 20943456 is 65434902.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20943457) 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, 66756 + ... + 67068.

It is an arithmetic number, because the mean of its divisors is an integer number (623133).

Almost surely, 2^20943456 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 20943456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29910384).

20943456 is an abundant number, since it is smaller than the sum of its proper divisors (38877312).

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

20943456 is a wasteful number, since it uses less digits than its factorization.

20943456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 20943456 is about 4576.4020802373. The cubic root of 20943456 is about 275.6445750465.

The spelling of 20943456 in words is "twenty million, nine hundred forty-three thousand, four hundred fifty-six".