20984930 has 24 divisors (see below), whose sum is σ = 39872412. Its totient is φ = 7950816.

The previous prime is 20984927. The next prime is 20984933. The reversal of 20984930 is 3948902.

It is an interprime number because it is at equal distance from previous prime (20984927) and next prime (20984933).

It can be written as a sum of positive squares in 2 ways, for example, as 20967241 + 17689 = 4579^2 + 133^2 .

It is not an unprimeable number, because it can be changed into a prime (20984933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 704 + ... + 6516.

Almost surely, 2^20984930 is an apocalyptic number.

20984930 is a deficient number, since it is larger than the sum of its proper divisors (18887482).

20984930 is a wasteful number, since it uses less digits than its factorization.

20984930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5858 (or 5839 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20984930 is about 4580.9311280568. The cubic root of 20984930 is about 275.8264066273.

The spelling of 20984930 in words is "twenty million, nine hundred eighty-four thousand, nine hundred thirty".