20666602 has 8 divisors (see below), whose sum is σ = 33818112. Its totient is φ = 9393900.

The previous prime is 20666599. The next prime is 20666603.

20666602 is nontrivially palindromic in base 10.

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

It is not an unprimeable number, because it can be changed into a prime (20666603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469674 + ... + 469717.

It is an arithmetic number, because the mean of its divisors is an integer number (4227264).

Almost surely, 2^20666602 is an apocalyptic number.

20666602 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20666602 is a deficient number, since it is larger than the sum of its proper divisors (13151510).

20666602 is a wasteful number, since it uses less digits than its factorization.

20666602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939404.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20666602 is about 4546.0534532713. The cubic root of 20666602 is about 274.4245907946.

It can be divided in two parts, 2066 and 6602, that added together give a palindrome (8668).

The spelling of 20666602 in words is "twenty million, six hundred sixty-six thousand, six hundred two".