20354481 has 12 divisors (see below), whose sum is σ = 33601152. Its totient is φ = 11631096.

The previous prime is 20354479. The next prime is 20354483. The reversal of 20354481 is 18445302.

It is an interprime number because it is at equal distance from previous prime (20354479) and next prime (20354483).

It is not a de Polignac number, because 20354481 - 2¹ = 20354479 is a prime.

It is a super-2 number, since 2×20354481² = 828609793558722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20354483) 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 11 ways as a sum of consecutive naturals, for example, 161481 + ... + 161606.

It is an arithmetic number, because the mean of its divisors is an integer number (2800096).

Almost surely, 2^20354481 is an apocalyptic number.

20354481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20354481 is a deficient number, since it is larger than the sum of its proper divisors (13246671).

20354481 is a wasteful number, since it uses less digits than its factorization.

20354481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323100 (or 323097 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20354481 is about 4511.5940641862. The cubic root of 20354481 is about 273.0360617338.

Adding to 20354481 its reverse (18445302), we get a palindrome (38799783).

The spelling of 20354481 in words is "twenty million, three hundred fifty-four thousand, four hundred eighty-one".