20666100115 has 16 divisors (see below), whose sum is σ = 24861720096. Its totient is φ = 16491328000.

The previous prime is 20666100083. The next prime is 20666100149. The reversal of 20666100115 is 51100166602.

It is not a de Polignac number, because 20666100115 - 2⁵ = 20666100083 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7376715 + ... + 7379515.

It is an arithmetic number, because the mean of its divisors is an integer number (1553857506).

Almost surely, 2^20666100115 is an apocalyptic number.

20666100115 is a deficient number, since it is larger than the sum of its proper divisors (4195619981).

20666100115 is a wasteful number, since it uses less digits than its factorization.

20666100115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5990.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 20666100115 its reverse (51100166602), we get a palindrome (71766266717).

The spelling of 20666100115 in words is "twenty billion, six hundred sixty-six million, one hundred thousand, one hundred fifteen".