20660493 has 16 divisors (see below), whose sum is σ = 31556096. Its totient is φ = 11778480.

The previous prime is 20660483. The next prime is 20660501. The reversal of 20660493 is 39406602.

It is a de Polignac number, because none of the positive numbers 2^k-20660493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20660493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660473) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11130 + ... + 12852.

It is an arithmetic number, because the mean of its divisors is an integer number (1972256).

Almost surely, 2^20660493 is an apocalyptic number.

It is an amenable number.

20660493 is a deficient number, since it is larger than the sum of its proper divisors (10895603).

20660493 is a wasteful number, since it uses less digits than its factorization.

20660493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 20660493 is about 4545.3815021404. The cubic root of 20660493 is about 274.3975483706.

The spelling of 20660493 in words is "twenty million, six hundred sixty thousand, four hundred ninety-three".