20721112 has 8 divisors (see below), whose sum is σ = 38852100. Its totient is φ = 10360552.

The previous prime is 20721101. The next prime is 20721131. The reversal of 20721112 is 21112702.

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

It is a congruent number.

It is an unprimeable number.

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, 1295062 + ... + 1295077.

Almost surely, 2^20721112 is an apocalyptic number.

It is an amenable number.

20721112 is a deficient number, since it is larger than the sum of its proper divisors (18130988).

20721112 is a wasteful number, since it uses less digits than its factorization.

20721112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590145 (or 2590141 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 20721112 is about 4552.0448152451. The cubic root of 20721112 is about 274.6656520632.

Adding to 20721112 its reverse (21112702), we get a palindrome (41833814).

The spelling of 20721112 in words is "twenty million, seven hundred twenty-one thousand, one hundred twelve".