20466121 has 4 divisors (see below), whose sum is σ = 22040452. Its totient is φ = 18891792.

The previous prime is 20466119. The next prime is 20466139. The reversal of 20466121 is 12166402.

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 2446096 + 18020025 = 1564^2 + 4245^2 .

It is a cyclic number.

It is not a de Polignac number, because 20466121 - 2¹ = 20466119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20466092 and 20466101.

It is not an unprimeable number, because it can be changed into a prime (20466101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787146 + ... + 787171.

It is an arithmetic number, because the mean of its divisors is an integer number (5510113).

Almost surely, 2^20466121 is an apocalyptic number.

It is an amenable number.

20466121 is a deficient number, since it is larger than the sum of its proper divisors (1574331).

20466121 is a wasteful number, since it uses less digits than its factorization.

20466121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574330.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20466121 is about 4523.9497123642. The cubic root of 20466121 is about 273.5343334493.

The spelling of 20466121 in words is "twenty million, four hundred sixty-six thousand, one hundred twenty-one".