20306481 has 8 divisors (see below), whose sum is σ = 29158080. Its totient is φ = 12496272.

The previous prime is 20306471. The next prime is 20306513. The reversal of 20306481 is 18460302.

It is a happy number.

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

It is not a de Polignac number, because 20306481 - 2⁹ = 20305969 is a prime.

It is a super-2 number, since 2×20306481² = 824706341206722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20306431) 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, 260301 + ... + 260378.

It is an arithmetic number, because the mean of its divisors is an integer number (3644760).

Almost surely, 2^20306481 is an apocalyptic number.

It is an amenable number.

20306481 is a deficient number, since it is larger than the sum of its proper divisors (8851599).

20306481 is a wasteful number, since it uses less digits than its factorization.

20306481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520695.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20306481 is about 4506.2712967597. The cubic root of 20306481 is about 272.8212679746.

Adding to 20306481 its reverse (18460302), we get a palindrome (38766783).

The spelling of 20306481 in words is "twenty million, three hundred six thousand, four hundred eighty-one".