20246161 has 4 divisors (see below), whose sum is σ = 21803572. Its totient is φ = 18688752.

The previous prime is 20246129. The next prime is 20246173. The reversal of 20246161 is 16164202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5569600 + 14676561 = 2360^2 + 3831^2 .

It is a cyclic number.

It is not a de Polignac number, because 20246161 - 2⁵ = 20246129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20246101) 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 3 ways as a sum of consecutive naturals, for example, 778686 + ... + 778711.

It is an arithmetic number, because the mean of its divisors is an integer number (5450893).

Almost surely, 2^20246161 is an apocalyptic number.

It is an amenable number.

20246161 is a deficient number, since it is larger than the sum of its proper divisors (1557411).

20246161 is a wasteful number, since it uses less digits than its factorization.

20246161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557410.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20246161 is about 4499.5734242259. The cubic root of 20246161 is about 272.5508633277.

The spelling of 20246161 in words is "twenty million, two hundred forty-six thousand, one hundred sixty-one".