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20656672 = 25645521
BaseRepresentation
bin100111011001…
…1001000100000
31102212110121221
41032303020200
520242003142
62014424424
7340402351
oct116631040
942773557
1020656672
1110729733
126b02114
1343832aa
142a59d28
151c30767
hex13b3220

20656672 has 12 divisors (see below), whose sum is σ = 40667886. Its totient is φ = 10328320.

The previous prime is 20656639. The next prime is 20656679. The reversal of 20656672 is 27665602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20466576 + 190096 = 4524^2 + 436^2 .

It is not an unprimeable number, because it can be changed into a prime (20656679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322729 + ... + 322792.

Almost surely, 220656672 is an apocalyptic number.

It is an amenable number.

20656672 is a deficient number, since it is larger than the sum of its proper divisors (20011214).

20656672 is an equidigital number, since it uses as much as digits as its factorization.

20656672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645531 (or 645523 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20656672 is about 4544.9611659507. The cubic root of 20656672 is about 274.3806314191.

The spelling of 20656672 in words is "twenty million, six hundred fifty-six thousand, six hundred seventy-two".

Divisors: 1 2 4 8 16 32 645521 1291042 2582084 5164168 10328336 20656672