20111642 has 8 divisors (see below), whose sum is σ = 30226932. Its totient is φ = 10036000.

The previous prime is 20111621. The next prime is 20111681. The reversal of 20111642 is 24611102.

It can be written as a sum of positive squares in 2 ways, for example, as 19989841 + 121801 = 4471^2 + 349^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20111642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8609 + ... + 10692.

Almost surely, 2^20111642 is an apocalyptic number.

20111642 is a deficient number, since it is larger than the sum of its proper divisors (10115290).

20111642 is a wasteful number, since it uses less digits than its factorization.

20111642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19824.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20111642 is about 4484.6005396245. The cubic root of 20111642 is about 271.9458964622.

Adding to 20111642 its reverse (24611102), we get a palindrome (44722744).

The spelling of 20111642 in words is "twenty million, one hundred eleven thousand, six hundred forty-two".