20420445 has 8 divisors (see below), whose sum is σ = 32672736. Its totient is φ = 10890896.

The previous prime is 20420443. The next prime is 20420453. The reversal of 20420445 is 54402402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20420445 - 2¹ = 20420443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680667 + ... + 680696.

It is an arithmetic number, because the mean of its divisors is an integer number (4084092).

Almost surely, 2^20420445 is an apocalyptic number.

It is an amenable number.

20420445 is a deficient number, since it is larger than the sum of its proper divisors (12252291).

20420445 is a wasteful number, since it uses less digits than its factorization.

20420445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361371.

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20420445 is about 4518.8986490073. The cubic root of 20420445 is about 273.3306918576.

Adding to 20420445 its reverse (54402402), we get a palindrome (74822847).

The spelling of 20420445 in words is "twenty million, four hundred twenty thousand, four hundred forty-five".