20289413 has 4 divisors (see below), whose sum is σ = 20435520. Its totient is φ = 20143308.

The previous prime is 20289403. The next prime is 20289439. The reversal of 20289413 is 31498202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31498202 = 2 ⋅15749101.

It is a cyclic number.

It is not a de Polignac number, because 20289413 - 2⁶ = 20289349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72845 + ... + 73122.

It is an arithmetic number, because the mean of its divisors is an integer number (5108880).

Almost surely, 2^20289413 is an apocalyptic number.

It is an amenable number.

20289413 is a deficient number, since it is larger than the sum of its proper divisors (146107).

20289413 is a wasteful number, since it uses less digits than its factorization.

20289413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146106.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20289413 is about 4504.3770934503. The cubic root of 20289413 is about 272.7448093202.

It can be divided in two parts, 20289 and 413, that added together give a palindrome (20702).

The spelling of 20289413 in words is "twenty million, two hundred eighty-nine thousand, four hundred thirteen".