20702984 has 16 divisors (see below), whose sum is σ = 40157100. Its totient is φ = 9994432.

The previous prime is 20702971. The next prime is 20702987. The reversal of 20702984 is 48920702.

It can be written as a sum of positive squares in 2 ways, for example, as 20702500 + 484 = 4550^2 + 22^2 .

It is a super-2 number, since 2×20702984² = 857227093008512, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20702984.

It is not an unprimeable number, because it can be changed into a prime (20702987) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 44387 + ... + 44850.

Almost surely, 2^20702984 is an apocalyptic number.

It is an amenable number.

20702984 is a deficient number, since it is larger than the sum of its proper divisors (19454116).

20702984 is a wasteful number, since it uses less digits than its factorization.

20702984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89272 (or 89268 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20702984 is about 4550.0531865023. The cubic root of 20702984 is about 274.5855310147.

The spelling of 20702984 in words is "twenty million, seven hundred two thousand, nine hundred eighty-four".