20264221 has 4 divisors (see below), whose sum is σ = 21456252. Its totient is φ = 19072192.

The previous prime is 20264207. The next prime is 20264227. The reversal of 20264221 is 12246202.

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 17131321 + 3132900 = 4139^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 20264221 - 2¹¹ = 20262173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20264227) 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 3 ways as a sum of consecutive naturals, for example, 595990 + ... + 596023.

It is an arithmetic number, because the mean of its divisors is an integer number (5364063).

Almost surely, 2^20264221 is an apocalyptic number.

It is an amenable number.

20264221 is a deficient number, since it is larger than the sum of its proper divisors (1192031).

20264221 is a wasteful number, since it uses less digits than its factorization.

20264221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192030.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20264221 is about 4501.5798337917. The cubic root of 20264221 is about 272.6318796041.

The spelling of 20264221 in words is "twenty million, two hundred sixty-four thousand, two hundred twenty-one".