20081056 has 36 divisors (see below), whose sum is σ = 40913586. Its totient is φ = 9701760.

The previous prime is 20081053. The next prime is 20081057. The reversal of 20081056 is 65018002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 1245456 = 4340^2 + 1116^2 .

It is not an unprimeable number, because it can be changed into a prime (20081051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30426 + ... + 31078.

Almost surely, 2^20081056 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 20081056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20456793).

20081056 is an abundant number, since it is smaller than the sum of its proper divisors (20832530).

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

20081056 is an equidigital number, since it uses as much as digits as its factorization.

20081056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 20081056 is about 4481.1891278990. The cubic root of 20081056 is about 271.8079671089.

Adding to 20081056 its reverse (65018002), we get a palindrome (85099058).

The spelling of 20081056 in words is "twenty million, eighty-one thousand, fifty-six".