20472227 has 4 divisors (see below), whose sum is σ = 20557416. Its totient is φ = 20387040.

The previous prime is 20472223. The next prime is 20472241. The reversal of 20472227 is 72227402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20472227 - 2² = 20472223 is a prime.

It is a super-2 number, since 2×20472227² = 838224156679058, 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 = 20472196 and 20472205.

It is not an unprimeable number, because it can be changed into a prime (20472223) 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, 42233 + ... + 42714.

It is an arithmetic number, because the mean of its divisors is an integer number (5139354).

Almost surely, 2^20472227 is an apocalyptic number.

20472227 is a deficient number, since it is larger than the sum of its proper divisors (85189).

20472227 is an equidigital number, since it uses as much as digits as its factorization.

20472227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85188.

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 20472227 is about 4524.6245148078. The cubic root of 20472227 is about 273.5615334345.

Adding to 20472227 its reverse (72227402), we get a palindrome (92699629).

The spelling of 20472227 in words is "twenty million, four hundred seventy-two thousand, two hundred twenty-seven".