20874984 has 64 divisors (see below), whose sum is σ = 58665600. Its totient is φ = 6141696.

The previous prime is 20874979. The next prime is 20875009. The reversal of 20874984 is 48947802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5722 + ... + 8630.

It is an arithmetic number, because the mean of its divisors is an integer number (916650).

Almost surely, 2^20874984 is an apocalyptic number.

20874984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20874984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29332800).

20874984 is an abundant number, since it is smaller than the sum of its proper divisors (37790616).

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

20874984 is a wasteful number, since it uses less digits than its factorization.

20874984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954 (or 2950 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 20874984 is about 4568.9149696618. The cubic root of 20874984 is about 275.3438519720.

The spelling of 20874984 in words is "twenty million, eight hundred seventy-four thousand, nine hundred eighty-four".