20660651 has 8 divisors (see below), whose sum is σ = 22581504. Its totient is φ = 18746920.

The previous prime is 20660621. The next prime is 20660659. The reversal of 20660651 is 15606602.

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

It is a cyclic number.

It is not a de Polignac number, because 20660651 - 2⁶ = 20660587 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20660651.

It is not an unprimeable number, because it can be changed into a prime (20660659) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5666 + ... + 8568.

It is an arithmetic number, because the mean of its divisors is an integer number (2822688).

Almost surely, 2^20660651 is an apocalyptic number.

20660651 is a deficient number, since it is larger than the sum of its proper divisors (1920853).

20660651 is a wasteful number, since it uses less digits than its factorization.

20660651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20660651 is about 4545.3988823865. The cubic root of 20660651 is about 274.3982478490.

The spelling of 20660651 in words is "twenty million, six hundred sixty thousand, six hundred fifty-one".