20162666 has 4 divisors (see below), whose sum is σ = 30244002. Its totient is φ = 10081332.

The previous prime is 20162641. The next prime is 20162717. The reversal of 20162666 is 66626102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66626102 = 2 ⋅33313051.

It can be written as a sum of positive squares in only one way, i.e., 19404025 + 758641 = 4405^2 + 871^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5040665 + ... + 5040668.

Almost surely, 2^20162666 is an apocalyptic number.

20162666 is a deficient number, since it is larger than the sum of its proper divisors (10081336).

20162666 is a wasteful number, since it uses less digits than its factorization.

20162666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10081335.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20162666 is about 4490.2857370105. The cubic root of 20162666 is about 272.1756812718.

Adding to 20162666 its reverse (66626102), we get a palindrome (86788768).

The spelling of 20162666 in words is "twenty million, one hundred sixty-two thousand, six hundred sixty-six".