20324881 has 2 divisors, whose sum is σ = 20324882. Its totient is φ = 20324880.

The previous prime is 20324873. The next prime is 20324891. The reversal of 20324881 is 18842302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17297281 + 3027600 = 4159^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 20324881 - 2³ = 20324873 is a prime.

It is a super-2 number, since 2×20324881² = 826201575328322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20324891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10162440 + 10162441.

It is an arithmetic number, because the mean of its divisors is an integer number (10162441).

Almost surely, 2^20324881 is an apocalyptic number.

It is an amenable number.

20324881 is a deficient number, since it is larger than the sum of its proper divisors (1).

20324881 is an equidigital number, since it uses as much as digits as its factorization.

20324881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20324881 is about 4508.3124337162. The cubic root of 20324881 is about 272.9036455480.

The spelling of 20324881 in words is "twenty million, three hundred twenty-four thousand, eight hundred eighty-one".