20831484 has 24 divisors (see below), whose sum is σ = 49432320. Its totient is φ = 6825904.

The previous prime is 20831323. The next prime is 20831533. The reversal of 20831484 is 48413802.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14004 + ... + 15419.

It is an arithmetic number, because the mean of its divisors is an integer number (2059680).

Almost surely, 2^20831484 is an apocalyptic number.

It is an amenable number.

20831484 is an abundant number, since it is smaller than the sum of its proper divisors (28600836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20831484 is a wasteful number, since it uses less digits than its factorization.

20831484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29489 (or 29487 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 20831484 is about 4564.1520570638. The cubic root of 20831484 is about 275.1524620148.

The spelling of 20831484 in words is "twenty million, eight hundred thirty-one thousand, four hundred eighty-four".