20013689 has 2 divisors, whose sum is σ = 20013690. Its totient is φ = 20013688.

The previous prime is 20013671. The next prime is 20013731. The reversal of 20013689 is 98631002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13017664 + 6996025 = 3608^2 + 2645^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013689 - 2¹² = 20009593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20013659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006844 + 10006845.

It is an arithmetic number, because the mean of its divisors is an integer number (10006845).

Almost surely, 2^20013689 is an apocalyptic number.

It is an amenable number.

20013689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013689 is an equidigital number, since it uses as much as digits as its factorization.

20013689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 20013689 is about 4473.6661699327. Note that the first 3 decimals coincide. The cubic root of 20013689 is about 271.5036769736.

It can be divided in two parts, 20013 and 689, that added together give a palindrome (20702).

The spelling of 20013689 in words is "twenty million, thirteen thousand, six hundred eighty-nine".