20831467 has 4 divisors (see below), whose sum is σ = 21927880. Its totient is φ = 19735056.

The previous prime is 20831323. The next prime is 20831533. The reversal of 20831467 is 76413802.

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 20831467 - 2¹⁹ = 20307179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20831267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548178 + ... + 548215.

It is an arithmetic number, because the mean of its divisors is an integer number (5481970).

Almost surely, 2^20831467 is an apocalyptic number.

20831467 is a deficient number, since it is larger than the sum of its proper divisors (1096413).

20831467 is a wasteful number, since it uses less digits than its factorization.

20831467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096412.

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

The square root of 20831467 is about 4564.1501947241. The cubic root of 20831467 is about 275.1523871667.

The spelling of 20831467 in words is "twenty million, eight hundred thirty-one thousand, four hundred sixty-seven".