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20688107 = 112964853
BaseRepresentation
bin100111011101…
…0110011101011
31102221001202012
41032322303223
520244004412
62015230135
7340563116
oct116726353
942831665
1020688107
1110750310
126b1834b
1343946ab
142a6757d
151c39c22
hex13baceb

20688107 has 8 divisors (see below), whose sum is σ = 23347440. Its totient is φ = 18158560.

The previous prime is 20688103. The next prime is 20688113. The reversal of 20688107 is 70188602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20688107 - 22 = 20688103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20688103) 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, 32108 + ... + 32745.

It is an arithmetic number, because the mean of its divisors is an integer number (2918430).

Almost surely, 220688107 is an apocalyptic number.

20688107 is a deficient number, since it is larger than the sum of its proper divisors (2659333).

20688107 is a wasteful number, since it uses less digits than its factorization.

20688107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64893.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 20688107 is about 4548.4180766504. The cubic root of 20688107 is about 274.5197435929.

The spelling of 20688107 in words is "twenty million, six hundred eighty-eight thousand, one hundred seven".

Divisors: 1 11 29 319 64853 713383 1880737 20688107