20115112 has 8 divisors (see below), whose sum is σ = 37715850. Its totient is φ = 10057552.

The previous prime is 20115101. The next prime is 20115113. The reversal of 20115112 is 21151102.

It can be written as a sum of positive squares in only one way, i.e., 13734436 + 6380676 = 3706^2 + 2526^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20115092 and 20115101.

It is not an unprimeable number, because it can be changed into a prime (20115113) 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 as a sum of consecutive naturals, namely, 1257187 + ... + 1257202.

Almost surely, 2^20115112 is an apocalyptic number.

It is an amenable number.

20115112 is a deficient number, since it is larger than the sum of its proper divisors (17600738).

20115112 is a wasteful number, since it uses less digits than its factorization.

20115112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2514395 (or 2514391 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 20115112 is about 4484.9874024349. The cubic root of 20115112 is about 271.9615357951.

Adding to 20115112 its reverse (21151102), we get a palindrome (41266214).

The spelling of 20115112 in words is "twenty million, one hundred fifteen thousand, one hundred twelve".