20984020 has 12 divisors (see below), whose sum is σ = 44066484. Its totient is φ = 8393600.

The previous prime is 20983997. The next prime is 20984021. The reversal of 20984020 is 2048902.

It can be written as a sum of positive squares in 2 ways, for example, as 16370116 + 4613904 = 4046^2 + 2148^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20984021) 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, 524581 + ... + 524620.

It is an arithmetic number, because the mean of its divisors is an integer number (3672207).

Almost surely, 2^20984020 is an apocalyptic number.

20984020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20984020 is an abundant number, since it is smaller than the sum of its proper divisors (23082464).

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

20984020 is a wasteful number, since it uses less digits than its factorization.

20984020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049210 (or 1049208 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20984020 is about 4580.8318021949. The cubic root of 20984020 is about 275.8224195493.

The spelling of 20984020 in words is "twenty million, nine hundred eighty-four thousand, twenty".