20047211 has 4 divisors (see below), whose sum is σ = 20065752. Its totient is φ = 20028672.

The previous prime is 20047201. The next prime is 20047241. The reversal of 20047211 is 11274002.

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 20047211 - 2¹⁸ = 19785067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20047211.

It is not an unprimeable number, because it can be changed into a prime (20047201) 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, 7541 + ... + 9846.

It is an arithmetic number, because the mean of its divisors is an integer number (5016438).

Almost surely, 2^20047211 is an apocalyptic number.

20047211 is a deficient number, since it is larger than the sum of its proper divisors (18541).

20047211 is a wasteful number, since it uses less digits than its factorization.

20047211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18540.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20047211 is about 4477.4111939825. The cubic root of 20047211 is about 271.6551777712.

The spelling of 20047211 in words is "twenty million, forty-seven thousand, two hundred eleven".