20456331 has 32 divisors (see below), whose sum is σ = 33116160. Its totient is φ = 10971936.

The previous prime is 20456329. The next prime is 20456333. The reversal of 20456331 is 13365402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20456329) and next prime (20456333).

It is not a de Polignac number, because 20456331 - 2¹ = 20456329 is a prime.

It is a super-2 number, since 2×20456331² = 836922955963122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20456333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66480 + ... + 66786.

It is an arithmetic number, because the mean of its divisors is an integer number (1034880).

Almost surely, 2^20456331 is an apocalyptic number.

20456331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20456331 is a deficient number, since it is larger than the sum of its proper divisors (12659829).

20456331 is a wasteful number, since it uses less digits than its factorization.

20456331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20456331 is about 4522.8675638360. The cubic root of 20456331 is about 273.4907113053.

The spelling of 20456331 in words is "twenty million, four hundred fifty-six thousand, three hundred thirty-one".