18987255

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{79}}^1\times {\mathrm{109}}^1$

素因数の和:213

約数の個数: 72

約数和(自身を含む): 39124800

約数和(自身を除く): 20137545

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 49, 63, 79, 105, 109, 147, 237, 245, 315, 327, 395, 441, 545, 553, 711, 735, 763, 981, 1185, 1635, 1659, 2205, 2289, 2765, 3555, 3815, 3871, 4905, 4977, 5341, 6867, 8295, 8611, 11445, 11613, 16023, 19355, 24885, 25833, 26705, 34335, 34839, 43055, 48069, 58065, 60277, 77499, 80115, 129165, 174195, 180831, 240345, 301385, 387495, 421939, 542493, 904155, 1265817, 2109695, 2712465, 3797451, 6329085, 18987255]

約数ペア:

[(1, 18987255), (3, 6329085), (5, 3797451), (7, 2712465), (9, 2109695), (15, 1265817), (21, 904155), (35, 542493), (45, 421939), (49, 387495), (63, 301385), (79, 240345), (105, 180831), (109, 174195), (147, 129165), (237, 80115), (245, 77499), (315, 60277), (327, 58065), (395, 48069), (441, 43055), (545, 34839), (553, 34335), (711, 26705), (735, 25833), (763, 24885), (981, 19355), (1185, 16023), (1635, 11613), (1659, 11445), (2205, 8611), (2289, 8295), (2765, 6867), (3555, 5341), (3815, 4977), (3871, 4905)]