20126661 has 8 divisors (see below), whose sum is σ = 26971200. Its totient is φ = 13349952.

The previous prime is 20126597. The next prime is 20126663. The reversal of 20126661 is 16662102.

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

It is not a de Polignac number, because 20126661 - 2⁶ = 20126597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20126663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16260 + ... + 17453.

It is an arithmetic number, because the mean of its divisors is an integer number (3371400).

Almost surely, 2^20126661 is an apocalyptic number.

It is an amenable number.

20126661 is a deficient number, since it is larger than the sum of its proper divisors (6844539).

20126661 is a wasteful number, since it uses less digits than its factorization.

20126661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33915.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20126661 is about 4486.2747352341. The cubic root of 20126661 is about 272.0135743298.

Adding to 20126661 its reverse (16662102), we get a palindrome (36788763).

It can be divided in two parts, 201 and 26661, that added together give a palindrome (26862).

The spelling of 20126661 in words is "twenty million, one hundred twenty-six thousand, six hundred sixty-one".