20080220

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{79}}^1\times {\mathrm{179}}^1$

素因数の和:338

約数の個数: 48

約数和(自身を含む): 43545600

約数和(自身を除く): 23465380

約数列:

[1, 2, 4, 5, 10, 20, 71, 79, 142, 158, 179, 284, 316, 355, 358, 395, 710, 716, 790, 895, 1420, 1580, 1790, 3580, 5609, 11218, 12709, 14141, 22436, 25418, 28045, 28282, 50836, 56090, 56564, 63545, 70705, 112180, 127090, 141410, 254180, 282820, 1004011, 2008022, 4016044, 5020055, 10040110, 20080220]

約数ペア:

[(1, 20080220), (2, 10040110), (4, 5020055), (5, 4016044), (10, 2008022), (20, 1004011), (71, 282820), (79, 254180), (142, 141410), (158, 127090), (179, 112180), (284, 70705), (316, 63545), (355, 56564), (358, 56090), (395, 50836), (710, 28282), (716, 28045), (790, 25418), (895, 22436), (1420, 14141), (1580, 12709), (1790, 11218), (3580, 5609)]