20742111 has 12 divisors (see below), whose sum is σ = 32265688. Its totient is φ = 12764304.

The previous prime is 20742109. The next prime is 20742151. The reversal of 20742111 is 11124702.

It is not a de Polignac number, because 20742111 - 2¹ = 20742109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88525 + ... + 88758.

Almost surely, 2^20742111 is an apocalyptic number.

20742111 is a deficient number, since it is larger than the sum of its proper divisors (11523577).

20742111 is a wasteful number, since it uses less digits than its factorization.

20742111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177302 (or 177299 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 20742111 is about 4554.3507770043. The cubic root of 20742111 is about 274.7584037902.

Adding to 20742111 its reverse (11124702), we get a palindrome (31866813).

The spelling of 20742111 in words is "twenty million, seven hundred forty-two thousand, one hundred eleven".