20166669 has 6 divisors (see below), whose sum is σ = 29129646. Its totient is φ = 13444440.

The previous prime is 20166667. The next prime is 20166683. The reversal of 20166669 is 96666102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16305444 + 3861225 = 4038^2 + 1965^2 .

It is not a de Polignac number, because 20166669 - 2¹ = 20166667 is a prime.

It is a super-2 number, since 2×20166669² = 813389077111122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20166667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1120362 + ... + 1120379.

It is an arithmetic number, because the mean of its divisors is an integer number (4854941).

Almost surely, 2^20166669 is an apocalyptic number.

It is an amenable number.

20166669 is a deficient number, since it is larger than the sum of its proper divisors (8962977).

20166669 is a wasteful number, since it uses less digits than its factorization.

20166669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240747 (or 2240744 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 20166669 is about 4490.7314548969. The cubic root of 20166669 is about 272.1936922358.

The spelling of 20166669 in words is "twenty million, one hundred sixty-six thousand, six hundred sixty-nine".