20472213 has 8 divisors (see below), whose sum is σ = 27877248. Its totient is φ = 13357664.

The previous prime is 20472209. The next prime is 20472217. The reversal of 20472213 is 31227402.

It is an interprime number because it is at equal distance from previous prime (20472209) and next prime (20472217).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20472213 - 2² = 20472209 is a prime.

It is a super-2 number, since 2×20472213² = 838223010234738, 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 20472213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472217) 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 7 ways as a sum of consecutive naturals, for example, 72456 + ... + 72737.

It is an arithmetic number, because the mean of its divisors is an integer number (3484656).

Almost surely, 2^20472213 is an apocalyptic number.

It is an amenable number.

20472213 is a deficient number, since it is larger than the sum of its proper divisors (7405035).

20472213 is a wasteful number, since it uses less digits than its factorization.

20472213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145243.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20472213 is about 4524.6229677179. The cubic root of 20472213 is about 273.5614710758.

Adding to 20472213 its reverse (31227402), we get a palindrome (51699615).

The spelling of 20472213 in words is "twenty million, four hundred seventy-two thousand, two hundred thirteen".