21217275

素因数分解:

$3^3\times 5^2\times {\mathrm{17}}^1\times {\mathrm{43}}^2$

素因数の和:122

約数の個数: 72

約数和(自身を含む): 42251760

約数和(自身を除く): 21034485

約数列:

[1, 3, 5, 9, 15, 17, 25, 27, 43, 45, 51, 75, 85, 129, 135, 153, 215, 225, 255, 387, 425, 459, 645, 675, 731, 765, 1075, 1161, 1275, 1849, 1935, 2193, 2295, 3225, 3655, 3825, 5547, 5805, 6579, 9245, 9675, 10965, 11475, 16641, 18275, 19737, 27735, 29025, 31433, 32895, 46225, 49923, 54825, 83205, 94299, 98685, 138675, 157165, 164475, 249615, 282897, 416025, 471495, 493425, 785825, 848691, 1248075, 1414485, 2357475, 4243455, 7072425, 21217275]

約数ペア:

[(1, 21217275), (3, 7072425), (5, 4243455), (9, 2357475), (15, 1414485), (17, 1248075), (25, 848691), (27, 785825), (43, 493425), (45, 471495), (51, 416025), (75, 282897), (85, 249615), (129, 164475), (135, 157165), (153, 138675), (215, 98685), (225, 94299), (255, 83205), (387, 54825), (425, 49923), (459, 46225), (645, 32895), (675, 31433), (731, 29025), (765, 27735), (1075, 19737), (1161, 18275), (1275, 16641), (1849, 11475), (1935, 10965), (2193, 9675), (2295, 9245), (3225, 6579), (3655, 5805), (3825, 5547)]