20454121 has 4 divisors (see below), whose sum is σ = 20953044. Its totient is φ = 19955200.

The previous prime is 20454113. The next prime is 20454139. The reversal of 20454121 is 12145402.

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 6948496 + 13505625 = 2636^2 + 3675^2 .

It is a cyclic number.

It is not a de Polignac number, because 20454121 - 2³ = 20454113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20454221) 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, 249400 + ... + 249481.

It is an arithmetic number, because the mean of its divisors is an integer number (5238261).

Almost surely, 2^20454121 is an apocalyptic number.

It is an amenable number.

20454121 is a deficient number, since it is larger than the sum of its proper divisors (498923).

20454121 is an equidigital number, since it uses as much as digits as its factorization.

20454121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498922.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20454121 is about 4522.6232432074. The cubic root of 20454121 is about 273.4808620930.

Adding to 20454121 its reverse (12145402), we get a palindrome (32599523).

The spelling of 20454121 in words is "twenty million, four hundred fifty-four thousand, one hundred twenty-one".