20120017 has 4 divisors (see below), whose sum is σ = 20188980. Its totient is φ = 20051056.

The previous prime is 20119991. The next prime is 20120029. The reversal of 20120017 is 71002102.

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 19749136 + 370881 = 4444^2 + 609^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120017 - 2²³ = 11731409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20119979 and 20120006.

It is not an unprimeable number, because it can be changed into a prime (20120047) 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, 34042 + ... + 34627.

It is an arithmetic number, because the mean of its divisors is an integer number (5047245).

Almost surely, 2^20120017 is an apocalyptic number.

It is an amenable number.

20120017 is a deficient number, since it is larger than the sum of its proper divisors (68963).

20120017 is an equidigital number, since it uses as much as digits as its factorization.

20120017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68962.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 20120017 is about 4485.5341933821. The cubic root of 20120017 is about 271.9836396229.

Adding to 20120017 its reverse (71002102), we get a palindrome (91122119).

The spelling of 20120017 in words is "twenty million, one hundred twenty thousand, seventeen".