20012117 has 4 divisors (see below), whose sum is σ = 20702220. Its totient is φ = 19322016.

The previous prime is 20012101. The next prime is 20012119. The reversal of 20012117 is 71121002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16048036 + 3964081 = 4006^2 + 1991^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012117 - 2⁴ = 20012101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345008 + ... + 345065.

It is an arithmetic number, because the mean of its divisors is an integer number (5175555).

Almost surely, 2^20012117 is an apocalyptic number.

It is an amenable number.

20012117 is a deficient number, since it is larger than the sum of its proper divisors (690103).

20012117 is an equidigital number, since it uses as much as digits as its factorization.

20012117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690102.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 20012117 is about 4473.4904716563. The cubic root of 20012117 is about 271.4965682566.

Adding to 20012117 its reverse (71121002), we get a palindrome (91133119).

The spelling of 20012117 in words is "twenty million, twelve thousand, one hundred seventeen".