20984556 has 24 divisors (see below), whose sum is σ = 51093504. Its totient is φ = 6690640.

The previous prime is 20984503. The next prime is 20984581. The reversal of 20984556 is 65548902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37740 + ... + 38291.

It is an arithmetic number, because the mean of its divisors is an integer number (2128896).

Almost surely, 2^20984556 is an apocalyptic number.

It is an amenable number.

20984556 is an abundant number, since it is smaller than the sum of its proper divisors (30108948).

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

20984556 is a wasteful number, since it uses less digits than its factorization.

20984556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76061 (or 76059 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 20984556 is about 4580.8903064797. The cubic root of 20984556 is about 275.8247679961.

The spelling of 20984556 in words is "twenty million, nine hundred eighty-four thousand, five hundred fifty-six".