21204505

素因数分解:

$5^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1$

素因数の和:166

約数の個数: 48

約数和(自身を含む): 31912704

約数和(自身を除く): 10708199

約数列:

[1, 5, 7, 23, 35, 49, 53, 71, 115, 161, 245, 265, 355, 371, 497, 805, 1127, 1219, 1633, 1855, 2485, 2597, 3479, 3763, 5635, 6095, 8165, 8533, 11431, 12985, 17395, 18815, 26341, 42665, 57155, 59731, 80017, 86549, 131705, 184387, 298655, 400085, 432745, 605843, 921935, 3029215, 4240901, 21204505]

約数ペア:

[(1, 21204505), (5, 4240901), (7, 3029215), (23, 921935), (35, 605843), (49, 432745), (53, 400085), (71, 298655), (115, 184387), (161, 131705), (245, 86549), (265, 80017), (355, 59731), (371, 57155), (497, 42665), (805, 26341), (1127, 18815), (1219, 17395), (1633, 12985), (1855, 11431), (2485, 8533), (2597, 8165), (3479, 6095), (3763, 5635)]