20420121 has 8 divisors (see below), whose sum is σ = 27328384. Its totient is φ = 13562640.

The previous prime is 20420119. The next prime is 20420129. The reversal of 20420121 is 12102402.

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

It is not a de Polignac number, because 20420121 - 2¹ = 20420119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20420097 and 20420106.

It is not an unprimeable number, because it can be changed into a prime (20420129) 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 7 ways as a sum of consecutive naturals, for example, 11746 + ... + 13371.

It is an arithmetic number, because the mean of its divisors is an integer number (3416048).

Almost surely, 2^20420121 is an apocalyptic number.

It is an amenable number.

20420121 is a deficient number, since it is larger than the sum of its proper divisors (6908263).

20420121 is a wasteful number, since it uses less digits than its factorization.

20420121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25391.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20420121 is about 4518.8627994220. The cubic root of 20420121 is about 273.3292462539.

Adding to 20420121 its reverse (12102402), we get a palindrome (32522523).

The spelling of 20420121 in words is "twenty million, four hundred twenty thousand, one hundred twenty-one".