20000669 has 8 divisors (see below), whose sum is σ = 21587832. Its totient is φ = 18420480.

The previous prime is 20000641. The next prime is 20000671. The reversal of 20000669 is 96600002.

It can be written as a sum of positive squares in 4 ways, for example, as 1295044 + 18705625 = 1138^2 + 4325^2 .

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

It is not a de Polignac number, because 20000669 - 2¹⁶ = 19935133 is a prime.

It is a super-2 number, since 2×20000669² = 800053520895122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5297 + ... + 8249.

It is an arithmetic number, because the mean of its divisors is an integer number (2698479).

Almost surely, 2^20000669 is an apocalyptic number.

It is an amenable number.

20000669 is a deficient number, since it is larger than the sum of its proper divisors (1587163).

20000669 is a wasteful number, since it uses less digits than its factorization.

20000669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3487.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20000669 is about 4472.2107508480. The cubic root of 20000669 is about 271.4447882014. Note that the first 3 decimals are identical.

The spelling of 20000669 in words is "twenty million, six hundred sixty-nine", and thus it is an aban number.