20120161 has 2 divisors, whose sum is σ = 20120162. Its totient is φ = 20120160.

The previous prime is 20120153. The next prime is 20120189. The reversal of 20120161 is 16102102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10627600 + 9492561 = 3260^2 + 3081^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120161 - 2³ = 20120153 is a prime.

It is not a weakly prime, because it can be changed into another prime (20150161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060080 + 10060081.

It is an arithmetic number, because the mean of its divisors is an integer number (10060081).

Almost surely, 2^20120161 is an apocalyptic number.

It is an amenable number.

20120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120161 is an equidigital number, since it uses as much as digits as its factorization.

20120161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 20120161 is about 4485.5502449532. The cubic root of 20120161 is about 271.9842884884.

Adding to 20120161 its reverse (16102102), we get a palindrome (36222263).

The spelling of 20120161 in words is "twenty million, one hundred twenty thousand, one hundred sixty-one".