20274221 has 4 divisors (see below), whose sum is σ = 22117344. Its totient is φ = 18431100.

The previous prime is 20274203. The next prime is 20274223. The reversal of 20274221 is 12247202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20274221 - 2⁶ = 20274157 is a prime.

It is a super-2 number, since 2×20274221² = 822088074313682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20274193 and 20274202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20274223) 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, 921545 + ... + 921566.

It is an arithmetic number, because the mean of its divisors is an integer number (5529336).

Almost surely, 2^20274221 is an apocalyptic number.

It is an amenable number.

20274221 is a deficient number, since it is larger than the sum of its proper divisors (1843123).

20274221 is a wasteful number, since it uses less digits than its factorization.

20274221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843122.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20274221 is about 4502.6904179612. The cubic root of 20274221 is about 272.6767184107.

The spelling of 20274221 in words is "twenty million, two hundred seventy-four thousand, two hundred twenty-one".