20815112 has 16 divisors (see below), whose sum is σ = 39100860. Its totient is φ = 10388224.

The previous prime is 20815099. The next prime is 20815117. The reversal of 20815112 is 21151802.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20666116 + 148996 = 4546^2 + 386^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20815117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2828 + ... + 7044.

Almost surely, 2^20815112 is an apocalyptic number.

It is an amenable number.

20815112 is a deficient number, since it is larger than the sum of its proper divisors (18285748).

20815112 is a wasteful number, since it uses less digits than its factorization.

20815112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4840 (or 4836 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 20815112 is about 4562.3581621789. The cubic root of 20815112 is about 275.0803599861.

Adding to 20815112 its reverse (21151802), we get a palindrome (41966914).

The spelling of 20815112 in words is "twenty million, eight hundred fifteen thousand, one hundred twelve".