20662131 has 8 divisors (see below), whose sum is σ = 31485184. Its totient is φ = 11806920.

The previous prime is 20662129. The next prime is 20662133. The reversal of 20662131 is 13126602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20662129) and next prime (20662133).

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

It is not a de Polignac number, because 20662131 - 2¹ = 20662129 is a prime.

It is a super-2 number, since 2×20662131² = 853847314922322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 983911 = 20662131 / (2 + 0 + 6 + 6 + 2 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20662098 and 20662107.

It is not an unprimeable number, because it can be changed into a prime (20662133) 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, 491935 + ... + 491976.

It is an arithmetic number, because the mean of its divisors is an integer number (3935648).

Almost surely, 2^20662131 is an apocalyptic number.

20662131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20662131 is a deficient number, since it is larger than the sum of its proper divisors (10823053).

20662131 is an equidigital number, since it uses as much as digits as its factorization.

20662131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983921.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20662131 is about 4545.5616814647. The cubic root of 20662131 is about 274.4047997514.

Adding to 20662131 its reverse (13126602), we get a palindrome (33788733).

The spelling of 20662131 in words is "twenty million, six hundred sixty-two thousand, one hundred thirty-one".