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20447147 = 710128921
BaseRepresentation
bin100110111111…
…1111110101011
31102110211012202
41031333332223
520213302042
62010130415
7335540450
oct115777653
942424182
1020447147
11105a6276
126a20a0b
13430bb06
142a03827
151bdd632
hex137ffab

20447147 has 8 divisors (see below), whose sum is σ = 23600352. Its totient is φ = 17352000.

The previous prime is 20447131. The next prime is 20447159. The reversal of 20447147 is 74174402.

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

It is a cyclic number.

It is not a de Polignac number, because 20447147 - 24 = 20447131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20441147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13754 + ... + 15167.

It is an arithmetic number, because the mean of its divisors is an integer number (2950044).

Almost surely, 220447147 is an apocalyptic number.

20447147 is a deficient number, since it is larger than the sum of its proper divisors (3153205).

20447147 is a wasteful number, since it uses less digits than its factorization.

20447147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29029.

The product of its (nonzero) digits is 6272, while the sum is 29.

The square root of 20447147 is about 4521.8521647661. The cubic root of 20447147 is about 273.4497767136.

The spelling of 20447147 in words is "twenty million, four hundred forty-seven thousand, one hundred forty-seven".

Divisors: 1 7 101 707 28921 202447 2921021 20447147