20111144 has 8 divisors (see below), whose sum is σ = 37708410. Its totient is φ = 10055568.

The previous prime is 20111137. The next prime is 20111167. The reversal of 20111144 is 44111102.

It can be written as a sum of positive squares in only one way, i.e., 17322244 + 2788900 = 4162^2 + 1670^2 .

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

It is a super-2 number, since 2×20111144² = 808916225977472, which contains 22 as substring.

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, 1256939 + ... + 1256954.

Almost surely, 2^20111144 is an apocalyptic number.

It is an amenable number.

20111144 is a deficient number, since it is larger than the sum of its proper divisors (17597266).

20111144 is a wasteful number, since it uses less digits than its factorization.

20111144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513899 (or 2513895 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 20111144 is about 4484.5450159409. The cubic root of 20111144 is about 271.9436518224.

Adding to 20111144 its reverse (44111102), we get a palindrome (64222246).

The spelling of 20111144 in words is "twenty million, one hundred eleven thousand, one hundred forty-four".