20643440

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{353}}^1$

素因数の和:426

約数の個数: 80

約数和(自身を含む): 52148448

約数和(自身を除く): 31505008

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 43, 68, 80, 85, 86, 136, 170, 172, 215, 272, 340, 344, 353, 430, 680, 688, 706, 731, 860, 1360, 1412, 1462, 1720, 1765, 2824, 2924, 3440, 3530, 3655, 5648, 5848, 6001, 7060, 7310, 11696, 12002, 14120, 14620, 15179, 24004, 28240, 29240, 30005, 30358, 48008, 58480, 60010, 60716, 75895, 96016, 120020, 121432, 151790, 240040, 242864, 258043, 303580, 480080, 516086, 607160, 1032172, 1214320, 1290215, 2064344, 2580430, 4128688, 5160860, 10321720, 20643440]

約数ペア:

[(1, 20643440), (2, 10321720), (4, 5160860), (5, 4128688), (8, 2580430), (10, 2064344), (16, 1290215), (17, 1214320), (20, 1032172), (34, 607160), (40, 516086), (43, 480080), (68, 303580), (80, 258043), (85, 242864), (86, 240040), (136, 151790), (170, 121432), (172, 120020), (215, 96016), (272, 75895), (340, 60716), (344, 60010), (353, 58480), (430, 48008), (680, 30358), (688, 30005), (706, 29240), (731, 28240), (860, 24004), (1360, 15179), (1412, 14620), (1462, 14120), (1720, 12002), (1765, 11696), (2824, 7310), (2924, 7060), (3440, 6001), (3530, 5848), (3655, 5648)]