21185145

素因数分解:

$3^4\times 5^1\times {\mathrm{17}}^2\times {\mathrm{181}}^1$

素因数の和:232

約数の個数: 60

約数和(自身を含む): 40564524

約数和(自身を除く): 19379379

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 81, 85, 135, 153, 181, 255, 289, 405, 459, 543, 765, 867, 905, 1377, 1445, 1629, 2295, 2601, 2715, 3077, 4335, 4887, 6885, 7803, 8145, 9231, 13005, 14661, 15385, 23409, 24435, 27693, 39015, 46155, 52309, 73305, 83079, 117045, 138465, 156927, 249237, 261545, 415395, 470781, 784635, 1246185, 1412343, 2353905, 4237029, 7061715, 21185145]

約数ペア:

[(1, 21185145), (3, 7061715), (5, 4237029), (9, 2353905), (15, 1412343), (17, 1246185), (27, 784635), (45, 470781), (51, 415395), (81, 261545), (85, 249237), (135, 156927), (153, 138465), (181, 117045), (255, 83079), (289, 73305), (405, 52309), (459, 46155), (543, 39015), (765, 27693), (867, 24435), (905, 23409), (1377, 15385), (1445, 14661), (1629, 13005), (2295, 9231), (2601, 8145), (2715, 7803), (3077, 6885), (4335, 4887)]