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20787474 = 233464579
BaseRepresentation
bin100111101001…
…1000100010010
31110010010001110
41033103010102
520310144344
62021314150
7341455611
oct117230422
943103043
1020787474
1110808a34
126b65956
1343ca9a6
142a91878
151c593b9
hex13d3112

20787474 has 8 divisors (see below), whose sum is σ = 41574960. Its totient is φ = 6929156.

The previous prime is 20787457. The next prime is 20787479. The reversal of 20787474 is 47478702.

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

20787474 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20787479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1732284 + ... + 1732295.

It is an arithmetic number, because the mean of its divisors is an integer number (5196870).

Almost surely, 220787474 is an apocalyptic number.

20787474 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20787474 is a wasteful number, since it uses less digits than its factorization.

20787474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3464584.

The product of its (nonzero) digits is 87808, while the sum is 39.

The square root of 20787474 is about 4559.3282399933. The cubic root of 20787474 is about 274.9585568401.

The spelling of 20787474 in words is "twenty million, seven hundred eighty-seven thousand, four hundred seventy-four".

Divisors: 1 2 3 6 3464579 6929158 10393737 20787474