20472219 has 6 divisors (see below), whose sum is σ = 29570996. Its totient is φ = 13648140.

The previous prime is 20472217. The next prime is 20472223. The reversal of 20472219 is 91227402.

It is not a de Polignac number, because 20472219 - 2¹ = 20472217 is a prime.

It is a super-2 number, since 2×20472219² = 838223501567922, 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 = 20472192 and 20472201.

It is not an unprimeable number, because it can be changed into a prime (20472217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1137337 + ... + 1137354.

Almost surely, 2^20472219 is an apocalyptic number.

20472219 is a deficient number, since it is larger than the sum of its proper divisors (9098777).

20472219 is a wasteful number, since it uses less digits than its factorization.

20472219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274697 (or 2274694 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20472219 is about 4524.6236307565. The cubic root of 20472219 is about 273.5614978010.

The spelling of 20472219 in words is "twenty million, four hundred seventy-two thousand, two hundred nineteen".