20923056 has 320 divisors, whose sum is σ = 81423360. Its totient is φ = 4976640.

The previous prime is 20923033. The next prime is 20923103. The reversal of 20923056 is 65032902.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 565470 + ... + 565506.

It is an arithmetic number, because the mean of its divisors is an integer number (254448).

Almost surely, 2^20923056 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 20923056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40711680).

20923056 is an abundant number, since it is smaller than the sum of its proper divisors (60500304).

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

20923056 is a wasteful number, since it uses less digits than its factorization.

20923056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20923056 is about 4574.1727120869. The cubic root of 20923056 is about 275.5550486559. Note that the first 3 decimals are identical.

Adding to 20923056 its reverse (65032902), we get a palindrome (85955958).

The spelling of 20923056 in words is "twenty million, nine hundred twenty-three thousand, fifty-six".