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20669619 = 36889873
BaseRepresentation
bin100111011011…
…0010010110011
31102220010101110
41032312102303
520242411434
62015004403
7340455165
oct116662263
942803343
1020669619
1110738433
126b09703
134389159
142a60935
151c344e9
hex13b64b3

20669619 has 4 divisors (see below), whose sum is σ = 27559496. Its totient is φ = 13779744.

The previous prime is 20669611. The next prime is 20669641. The reversal of 20669619 is 91696602.

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

It is not a de Polignac number, because 20669619 - 23 = 20669611 is a prime.

It is a super-2 number, since 2×206696192 = 854466299210322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20669611) 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, 3444934 + ... + 3444939.

It is an arithmetic number, because the mean of its divisors is an integer number (6889874).

Almost surely, 220669619 is an apocalyptic number.

20669619 is a deficient number, since it is larger than the sum of its proper divisors (6889877).

20669619 is an equidigital number, since it uses as much as digits as its factorization.

20669619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6889876.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 20669619 is about 4546.3852674405. The cubic root of 20669619 is about 274.4379440413.

The spelling of 20669619 in words is "twenty million, six hundred sixty-nine thousand, six hundred nineteen".

Divisors: 1 3 6889873 20669619