20506984 has 32 divisors (see below), whose sum is σ = 40824000. Its totient is φ = 9636352.

The previous prime is 20506979. The next prime is 20506987. The reversal of 20506984 is 48960502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9912 + ... + 11800.

It is an arithmetic number, because the mean of its divisors is an integer number (1275750).

Almost surely, 2^20506984 is an apocalyptic number.

It is an amenable number.

20506984 is a deficient number, since it is larger than the sum of its proper divisors (20317016).

20506984 is a wasteful number, since it uses less digits than its factorization.

20506984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977 (or 1973 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 20506984 is about 4528.4637571698. The cubic root of 20506984 is about 273.7162601676.

The spelling of 20506984 in words is "twenty million, five hundred six thousand, nine hundred eighty-four".