20346081 has 16 divisors (see below), whose sum is σ = 32073600. Its totient is φ = 11225088.

The previous prime is 20346071. The next prime is 20346089. The reversal of 20346081 is 18064302.

It is a happy number.

It is not a de Polignac number, because 20346081 - 2⁷ = 20345953 is a prime.

It is a super-2 number, since 2×20346081² = 827926024117122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20346089) 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 15 ways as a sum of consecutive naturals, for example, 16096 + ... + 17313.

It is an arithmetic number, because the mean of its divisors is an integer number (2004600).

Almost surely, 2^20346081 is an apocalyptic number.

20346081 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20346081 is a deficient number, since it is larger than the sum of its proper divisors (11727519).

20346081 is a wasteful number, since it uses less digits than its factorization.

20346081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33448.

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

The square root of 20346081 is about 4510.6630333023. The cubic root of 20346081 is about 272.9984972210.

The spelling of 20346081 in words is "twenty million, three hundred forty-six thousand, eighty-one".