20661117 has 8 divisors (see below), whose sum is σ = 27925824. Its totient is φ = 13585248.

The previous prime is 20661101. The next prime is 20661119. The reversal of 20661117 is 71116602.

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

It is not a de Polignac number, because 20661117 - 2⁴ = 20661101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20661119) 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, 46953 + ... + 47390.

It is an arithmetic number, because the mean of its divisors is an integer number (3490728).

Almost surely, 2^20661117 is an apocalyptic number.

It is an amenable number.

20661117 is a deficient number, since it is larger than the sum of its proper divisors (7264707).

20661117 is an equidigital number, since it uses as much as digits as its factorization.

20661117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94419.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 20661117 is about 4545.4501427251. The cubic root of 20661117 is about 274.4003108466.

Adding to 20661117 its reverse (71116602), we get a palindrome (91777719).

The spelling of 20661117 in words is "twenty million, six hundred sixty-one thousand, one hundred seventeen".