20473647 has 8 divisors (see below), whose sum is σ = 27376944. Its totient is φ = 13609728.

The previous prime is 20473601. The next prime is 20473667. The reversal of 20473647 is 74637402.

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

It is not a de Polignac number, because 20473647 - 2¹⁰ = 20472623 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20473667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8608 + ... + 10725.

It is an arithmetic number, because the mean of its divisors is an integer number (3422118).

Almost surely, 2^20473647 is an apocalyptic number.

20473647 is a deficient number, since it is larger than the sum of its proper divisors (6903297).

20473647 is a wasteful number, since it uses less digits than its factorization.

20473647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19689.

The product of its (nonzero) digits is 28224, while the sum is 33.

The square root of 20473647 is about 4524.7814311854. The cubic root of 20473647 is about 273.5678582373.

The spelling of 20473647 in words is "twenty million, four hundred seventy-three thousand, six hundred forty-seven".