20005161 has 16 divisors (see below), whose sum is σ = 29211840. Its totient is φ = 12077120.

The previous prime is 20005159. The next prime is 20005163. The reversal of 20005161 is 16150002.

It is an interprime number because it is at equal distance from previous prime (20005159) and next prime (20005163).

It is not a de Polignac number, because 20005161 - 2¹ = 20005159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20005161.

It is not an unprimeable number, because it can be changed into a prime (20005163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8635 + ... + 10703.

It is an arithmetic number, because the mean of its divisors is an integer number (1825740).

Almost surely, 2^20005161 is an apocalyptic number.

It is an amenable number.

20005161 is a deficient number, since it is larger than the sum of its proper divisors (9206679).

20005161 is a wasteful number, since it uses less digits than its factorization.

20005161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20005161 is about 4472.7129351211. The cubic root of 20005161 is about 271.4651081669.

Adding to 20005161 its reverse (16150002), we get a palindrome (36155163).

The spelling of 20005161 in words is "twenty million, five thousand, one hundred sixty-one".