20099669 has 4 divisors (see below), whose sum is σ = 20108844. Its totient is φ = 20090496.

The previous prime is 20099633. The next prime is 20099689. The reversal of 20099669 is 96699002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8334769 + 11764900 = 2887^2 + 3430^2 .

It is a cyclic number.

It is not a de Polignac number, because 20099669 - 2¹² = 20095573 is a prime.

It is a super-2 number, since 2×20099669² = 807993387819122, 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 (20099689) 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, 839 + ... + 6395.

It is an arithmetic number, because the mean of its divisors is an integer number (5027211).

Almost surely, 2^20099669 is an apocalyptic number.

It is an amenable number.

20099669 is a deficient number, since it is larger than the sum of its proper divisors (9175).

20099669 is an equidigital number, since it uses as much as digits as its factorization.

20099669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9174.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 20099669 is about 4483.2654393868. The cubic root of 20099669 is about 271.8919201871.

The spelling of 20099669 in words is "twenty million, ninety-nine thousand, six hundred sixty-nine".