20123361 has 12 divisors (see below), whose sum is σ = 30069780. Its totient is φ = 12952800.

The previous prime is 20123347. The next prime is 20123377. The reversal of 20123361 is 16332102.

It can be written as a sum of positive squares in 2 ways, for example, as 14745600 + 5377761 = 3840^2 + 2319^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20123361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20123381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38290 + ... + 38811.

It is an arithmetic number, because the mean of its divisors is an integer number (2505815).

Almost surely, 2^20123361 is an apocalyptic number.

It is an amenable number.

20123361 is a deficient number, since it is larger than the sum of its proper divisors (9946419).

20123361 is a wasteful number, since it uses less digits than its factorization.

20123361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77136 (or 77133 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20123361 is about 4485.9069317140. The cubic root of 20123361 is about 271.9987069215.

Adding to 20123361 its reverse (16332102), we get a palindrome (36455463).

The spelling of 20123361 in words is "twenty million, one hundred twenty-three thousand, three hundred sixty-one".