20481567 has 4 divisors (see below), whose sum is σ = 27308760. Its totient is φ = 13654376.

The previous prime is 20481557. The next prime is 20481577. The reversal of 20481567 is 76518402.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20481557) and next prime (20481577).

It is a cyclic number.

It is not a de Polignac number, because 20481567 - 2¹¹ = 20479519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20481557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3413592 + ... + 3413597.

It is an arithmetic number, because the mean of its divisors is an integer number (6827190).

Almost surely, 2^20481567 is an apocalyptic number.

20481567 is a deficient number, since it is larger than the sum of its proper divisors (6827193).

20481567 is an equidigital number, since it uses as much as digits as its factorization.

20481567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6827192.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20481567 is about 4525.6565269583. The cubic root of 20481567 is about 273.6031292390.

Adding to 20481567 its reverse (76518402), we get a palindrome (96999969).

The spelling of 20481567 in words is "twenty million, four hundred eighty-one thousand, five hundred sixty-seven".