20871463 has 4 divisors (see below), whose sum is σ = 21544768. Its totient is φ = 20198160.

The previous prime is 20871449. The next prime is 20871491. The reversal of 20871463 is 36417802.

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 20871463 - 2²¹ = 18774311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 673273 = 20871463 / (2 + 0 + 8 + 7 + 1 + 4 + 6 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20871413) 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, 336606 + ... + 336667.

It is an arithmetic number, because the mean of its divisors is an integer number (5386192).

Almost surely, 2^20871463 is an apocalyptic number.

20871463 is a deficient number, since it is larger than the sum of its proper divisors (673305).

20871463 is an equidigital number, since it uses as much as digits as its factorization.

20871463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673304.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20871463 is about 4568.5296321683. The cubic root of 20871463 is about 275.3283702800.

The spelling of 20871463 in words is "twenty million, eight hundred seventy-one thousand, four hundred sixty-three".