20111668 has 6 divisors (see below), whose sum is σ = 35195426. Its totient is φ = 10055832.

The previous prime is 20111621. The next prime is 20111681. The reversal of 20111668 is 86611102.

It can be written as a sum of positive squares in only one way, i.e., 19166884 + 944784 = 4378^2 + 972^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2513955 + ... + 2513962.

Almost surely, 2^20111668 is an apocalyptic number.

It is an amenable number.

20111668 is a deficient number, since it is larger than the sum of its proper divisors (15083758).

20111668 is a wasteful number, since it uses less digits than its factorization.

20111668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027921 (or 5027919 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20111668 is about 4484.6034384324. The cubic root of 20111668 is about 271.9460136512.

The spelling of 20111668 in words is "twenty million, one hundred eleven thousand, six hundred sixty-eight".