20661874 has 8 divisors (see below), whose sum is σ = 31164588. Its totient is φ = 10273680.

The previous prime is 20661869. The next prime is 20661881. The reversal of 20661874 is 47816602.

It can be written as a sum of positive squares in 2 ways, for example, as 16281225 + 4380649 = 4035^2 + 2093^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 28177 + ... + 28900.

Almost surely, 2^20661874 is an apocalyptic number.

20661874 is a deficient number, since it is larger than the sum of its proper divisors (10502714).

20661874 is a wasteful number, since it uses less digits than its factorization.

20661874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57260.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20661874 is about 4545.5334120431. The cubic root of 20661874 is about 274.4036620449.

The spelling of 20661874 in words is "twenty million, six hundred sixty-one thousand, eight hundred seventy-four".