20420541 has 6 divisors (see below), whose sum is σ = 29496350. Its totient is φ = 13613688.

The previous prime is 20420531. The next prime is 20420557. The reversal of 20420541 is 14502402.

It can be written as a sum of positive squares in only one way, i.e., 14220441 + 6200100 = 3771^2 + 2490^2 .

It is not a de Polignac number, because 20420541 - 2¹³ = 20412349 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 (20420531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1134466 + ... + 1134483.

Almost surely, 2^20420541 is an apocalyptic number.

It is an amenable number.

20420541 is a deficient number, since it is larger than the sum of its proper divisors (9075809).

20420541 is a wasteful number, since it uses less digits than its factorization.

20420541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268955 (or 2268952 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20420541 is about 4518.9092710520. The cubic root of 20420541 is about 273.3311201817.

Adding to 20420541 its reverse (14502402), we get a palindrome (34922943).

The spelling of 20420541 in words is "twenty million, four hundred twenty thousand, five hundred forty-one".