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20660719 = 122916811
BaseRepresentation
bin100111011010…
…0000111101111
31102212200011211
41032310013233
520242120334
62014455251
7340420222
oct116640757
942780154
1020660719
1110731782
126b04527
1343850a1
142a5b5b9
151c31a64
hex13b41ef

20660719 has 4 divisors (see below), whose sum is σ = 20678760. Its totient is φ = 20642680.

The previous prime is 20660701. The next prime is 20660743. The reversal of 20660719 is 91706602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20660719 - 25 = 20660687 is a prime.

It is a super-2 number, since 2×206607192 = 853730619193922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7177 + ... + 9634.

It is an arithmetic number, because the mean of its divisors is an integer number (5169690).

Almost surely, 220660719 is an apocalyptic number.

20660719 is a deficient number, since it is larger than the sum of its proper divisors (18041).

20660719 is a wasteful number, since it uses less digits than its factorization.

20660719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18040.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20660719 is about 4545.4063624719. The cubic root of 20660719 is about 274.3985488892.

The spelling of 20660719 in words is "twenty million, six hundred sixty thousand, seven hundred nineteen".

Divisors: 1 1229 16811 20660719