20221056 has 64 divisors (see below), whose sum is σ = 59690400. Its totient is φ = 6739200.

The previous prime is 20221049. The next prime is 20221079. The reversal of 20221056 is 65012202.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×20221056² = 817782211510272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531 + ... + 6381.

Almost surely, 2^20221056 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 20221056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29845200).

20221056 is an abundant number, since it is smaller than the sum of its proper divisors (39469344).

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

20221056 is an equidigital number, since it uses as much as digits as its factorization.

20221056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5874 (or 5856 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20221056 is about 4496.7828499940. The cubic root of 20221056 is about 272.4381634512.

Adding to 20221056 its reverse (65012202), we get a palindrome (85233258).

The spelling of 20221056 in words is "twenty million, two hundred twenty-one thousand, fifty-six".