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20671153 = 71291143
BaseRepresentation
bin100111011011…
…0101010110001
31102220012111021
41032312222301
520242434103
62015015441
7340462516
oct116665261
942805437
1020671153
11107395a8
126b0a581
134389a69
142a6130d
151c34bbd
hex13b6ab1

20671153 has 4 divisors (see below), whose sum is σ = 20962368. Its totient is φ = 20379940.

The previous prime is 20671151. The next prime is 20671159. The reversal of 20671153 is 35117602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20671153 - 21 = 20671151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20671151) 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, 145501 + ... + 145642.

It is an arithmetic number, because the mean of its divisors is an integer number (5240592).

Almost surely, 220671153 is an apocalyptic number.

It is an amenable number.

20671153 is a deficient number, since it is larger than the sum of its proper divisors (291215).

20671153 is an equidigital number, since it uses as much as digits as its factorization.

20671153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291214.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20671153 is about 4546.5539697666. The cubic root of 20671153 is about 274.4447330294. Note that the first 3 decimals are identical.

Adding to 20671153 its reverse (35117602), we get a palindrome (55788755).

The spelling of 20671153 in words is "twenty million, six hundred seventy-one thousand, one hundred fifty-three".

Divisors: 1 71 291143 20671153