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20660555 = 523179657
BaseRepresentation
bin100111011010…
…0000101001011
31102212122221202
41032310011023
520242114210
62014454415
7340416566
oct116640513
942778852
1020660555
1110731643
126b0440b
134384ca6
142a5b4dd
151c319a5
hex13b414b

20660555 has 8 divisors (see below), whose sum is σ = 25870752. Its totient is φ = 15809728.

The previous prime is 20660527. The next prime is 20660567. The reversal of 20660555 is 55506602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20660555 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89714 + ... + 89943.

It is an arithmetic number, because the mean of its divisors is an integer number (3233844).

Almost surely, 220660555 is an apocalyptic number.

20660555 is a deficient number, since it is larger than the sum of its proper divisors (5210197).

20660555 is a wasteful number, since it uses less digits than its factorization.

20660555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179685.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 20660555 is about 4545.3883222449. The cubic root of 20660555 is about 274.3978228499.

The spelling of 20660555 in words is "twenty million, six hundred sixty thousand, five hundred fifty-five".

Divisors: 1 5 23 115 179657 898285 4132111 20660555