20568481 has 8 divisors (see below), whose sum is σ = 20817504. Its totient is φ = 20321280.

The previous prime is 20568461. The next prime is 20568497. The reversal of 20568481 is 18486502.

20568481 = 145² + 146² + ... + 401².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20568481 - 2²³ = 12179873 is a prime.

It is a super-2 number, since 2×20568481² = 846124821294722, which contains 22 as substring.

It is a Duffinian number.

20568481 is a modest number, since divided by 8481 gives 2056 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20568421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41646 + ... + 42136.

It is an arithmetic number, because the mean of its divisors is an integer number (2602188).

Almost surely, 2^20568481 is an apocalyptic number.

It is an amenable number.

20568481 is a deficient number, since it is larger than the sum of its proper divisors (249023).

20568481 is a wasteful number, since it uses less digits than its factorization.

20568481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20568481 is about 4535.2487252630. The cubic root of 20568481 is about 273.9895968132.

It can be divided in two parts, 205 and 68481, that added together give a palindrome (68686).

The spelling of 20568481 in words is "twenty million, five hundred sixty-eight thousand, four hundred eighty-one".