20338661 has 8 divisors (see below), whose sum is σ = 23343360. Its totient is φ = 17358768.

The previous prime is 20338631. The next prime is 20338663. The reversal of 20338661 is 16683302.

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

It is a de Polignac number, because none of the positive numbers 2^k-20338661 is a prime.

It is a super-2 number, since 2×20338661² = 827322262545842, 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 (20338663) 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, 4406 + ... + 7751.

It is an arithmetic number, because the mean of its divisors is an integer number (2917920).

Almost surely, 2^20338661 is an apocalyptic number.

It is an amenable number.

20338661 is a deficient number, since it is larger than the sum of its proper divisors (3004699).

20338661 is a wasteful number, since it uses less digits than its factorization.

20338661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12403.

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

The square root of 20338661 is about 4509.8404628102. The cubic root of 20338661 is about 272.9653066335.

The spelling of 20338661 in words is "twenty million, three hundred thirty-eight thousand, six hundred sixty-one".