20072984 has 8 divisors (see below), whose sum is σ = 37636860. Its totient is φ = 10036488.

The previous prime is 20072957. The next prime is 20072989. The reversal of 20072984 is 48927002.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20072984.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20072989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1254554 + ... + 1254569.

Almost surely, 2^20072984 is an apocalyptic number.

It is an amenable number.

20072984 is a deficient number, since it is larger than the sum of its proper divisors (17563876).

20072984 is a wasteful number, since it uses less digits than its factorization.

20072984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509129 (or 2509125 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20072984 is about 4480.2883835753. The cubic root of 20072984 is about 271.7715425976.

Adding to 20072984 its reverse (48927002), we get a palindrome (68999986).

The spelling of 20072984 in words is "twenty million, seventy-two thousand, nine hundred eighty-four".