20485471 has 4 divisors (see below), whose sum is σ = 20677032. Its totient is φ = 20293912.

The previous prime is 20485469. The next prime is 20485483. The reversal of 20485471 is 17458402.

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 20485471 - 2¹ = 20485469 is a prime.

It is a super-3 number, since 3×20485471³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20485441) 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, 95620 + ... + 95833.

It is an arithmetic number, because the mean of its divisors is an integer number (5169258).

Almost surely, 2^20485471 is an apocalyptic number.

20485471 is a deficient number, since it is larger than the sum of its proper divisors (191561).

20485471 is a wasteful number, since it uses less digits than its factorization.

20485471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191560.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 20485471 is about 4526.0878250427. The cubic root of 20485471 is about 273.6205120034.

The spelling of 20485471 in words is "twenty million, four hundred eighty-five thousand, four hundred seventy-one".