20929566 has 48 divisors (see below), whose sum is σ = 49059216. Its totient is φ = 5935104.

The previous prime is 20929553. The next prime is 20929577. The reversal of 20929566 is 66592902.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75420 + ... + 75696.

It is an arithmetic number, because the mean of its divisors is an integer number (1022067).

Almost surely, 2^20929566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20929566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24529608).

20929566 is an abundant number, since it is smaller than the sum of its proper divisors (28129650).

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

20929566 is a wasteful number, since it uses less digits than its factorization.

20929566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 20929566 is about 4574.8842608311. The cubic root of 20929566 is about 275.5836244266.

The spelling of 20929566 in words is "twenty million, nine hundred twenty-nine thousand, five hundred sixty-six".