20854984 has 8 divisors (see below), whose sum is σ = 39103110. Its totient is φ = 10427488.

The previous prime is 20854979. The next prime is 20854987. The reversal of 20854984 is 48945802.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 334084 = 4530^2 + 578^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20854987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1303429 + ... + 1303444.

Almost surely, 2^20854984 is an apocalyptic number.

It is an amenable number.

20854984 is a deficient number, since it is larger than the sum of its proper divisors (18248126).

20854984 is a wasteful number, since it uses less digits than its factorization.

20854984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606879 (or 2606875 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 20854984 is about 4566.7257417104. The cubic root of 20854984 is about 275.2558896425.

The spelling of 20854984 in words is "twenty million, eight hundred fifty-four thousand, nine hundred eighty-four".