20813227 has 4 divisors (see below), whose sum is σ = 21908680. Its totient is φ = 19717776.

The previous prime is 20813207. The next prime is 20813237. The reversal of 20813227 is 72231802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72231802 = 2 ⋅36115901.

It is a cyclic number.

It is not a de Polignac number, because 20813227 - 2⁷ = 20813099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20813207) 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, 547698 + ... + 547735.

It is an arithmetic number, because the mean of its divisors is an integer number (5477170).

Almost surely, 2^20813227 is an apocalyptic number.

20813227 is a deficient number, since it is larger than the sum of its proper divisors (1095453).

20813227 is a wasteful number, since it uses less digits than its factorization.

20813227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095452.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20813227 is about 4562.1515757370. The cubic root of 20813227 is about 275.0720560492.

The spelling of 20813227 in words is "twenty million, eight hundred thirteen thousand, two hundred twenty-seven".