20472226 has 4 divisors (see below), whose sum is σ = 30708342. Its totient is φ = 10236112.

The previous prime is 20472223. The next prime is 20472241. The reversal of 20472226 is 62227402.

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

It can be written as a sum of positive squares in only one way, i.e., 17214201 + 3258025 = 4149^2 + 1805^2 .

It is a super-2 number, since 2×20472226² = 838224074790152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20472226.

It is not an unprimeable number, because it can be changed into a prime (20472223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5118055 + ... + 5118058.

Almost surely, 2^20472226 is an apocalyptic number.

20472226 is a deficient number, since it is larger than the sum of its proper divisors (10236116).

20472226 is a wasteful number, since it uses less digits than its factorization.

20472226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10236115.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20472226 is about 4524.6244043014. The cubic root of 20472226 is about 273.5615289803.

Adding to 20472226 its reverse (62227402), we get a palindrome (82699628).

The spelling of 20472226 in words is "twenty million, four hundred seventy-two thousand, two hundred twenty-six".