20968578 has 32 divisors (see below), whose sum is σ = 47131200. Its totient is φ = 6909408.

The previous prime is 20968573. The next prime is 20968579. The reversal of 20968578 is 87586902.

It is not an unprimeable number, because it can be changed into a prime (20968573) 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, 2625 + ... + 6987.

It is an arithmetic number, because the mean of its divisors is an integer number (1472850).

Almost surely, 2^20968578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20968578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23565600).

20968578 is an abundant number, since it is smaller than the sum of its proper divisors (26162622).

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

20968578 is a wasteful number, since it uses less digits than its factorization.

20968578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4463 (or 4457 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 20968578 is about 4579.1459902475. The cubic root of 20968578 is about 275.7547443213.

The spelling of 20968578 in words is "twenty million, nine hundred sixty-eight thousand, five hundred seventy-eight".