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20494984 = 232561873
BaseRepresentation
bin100111000101…
…1101010001000
31102120020211111
41032023222020
520221314414
62011140104
7336130066
oct116135210
942506744
1020494984
1110629204
126a44634
134327813
142a17036
151bec8c4
hex138ba88

20494984 has 8 divisors (see below), whose sum is σ = 38428110. Its totient is φ = 10247488.

The previous prime is 20494907. The next prime is 20494987. The reversal of 20494984 is 48949402.

It can be written as a sum of positive squares in only one way, i.e., 19554084 + 940900 = 4422^2 + 970^2 .

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 (20494987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280929 + ... + 1280944.

Almost surely, 220494984 is an apocalyptic number.

It is an amenable number.

20494984 is a deficient number, since it is larger than the sum of its proper divisors (17933126).

20494984 is a wasteful number, since it uses less digits than its factorization.

20494984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561879 (or 2561875 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 20494984 is about 4527.1386106458. The cubic root of 20494984 is about 273.6628598885.

The spelling of 20494984 in words is "twenty million, four hundred ninety-four thousand, nine hundred eighty-four".

Divisors: 1 2 4 8 2561873 5123746 10247492 20494984