20209056 has 192 divisors, whose sum is σ = 67495680. Its totient is φ = 5160960.

The previous prime is 20209043. The next prime is 20209061. The reversal of 20209056 is 65090202.

It is a super-2 number, since 2×20209056² = 816811888822272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331266 + ... + 331326.

It is an arithmetic number, because the mean of its divisors is an integer number (351540).

Almost surely, 2^20209056 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 20209056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33747840).

20209056 is an abundant number, since it is smaller than the sum of its proper divisors (47286624).

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

20209056 is a wasteful number, since it uses less digits than its factorization.

20209056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20209056 is about 4495.4483647352. The cubic root of 20209056 is about 272.3842608116.

Adding to 20209056 its reverse (65090202), we get a palindrome (85299258).

The spelling of 20209056 in words is "twenty million, two hundred nine thousand, fifty-six".