20280440

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{193}}^1$

素因数の和:312

約数の個数: 64

約数和(自身を含む): 47770560

約数和(自身を除く): 27490120

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 71, 74, 142, 148, 185, 193, 284, 296, 355, 370, 386, 568, 710, 740, 772, 965, 1420, 1480, 1544, 1930, 2627, 2840, 3860, 5254, 7141, 7720, 10508, 13135, 13703, 14282, 21016, 26270, 27406, 28564, 35705, 52540, 54812, 57128, 68515, 71410, 105080, 109624, 137030, 142820, 274060, 285640, 507011, 548120, 1014022, 2028044, 2535055, 4056088, 5070110, 10140220, 20280440]

約数ペア:

[(1, 20280440), (2, 10140220), (4, 5070110), (5, 4056088), (8, 2535055), (10, 2028044), (20, 1014022), (37, 548120), (40, 507011), (71, 285640), (74, 274060), (142, 142820), (148, 137030), (185, 109624), (193, 105080), (284, 71410), (296, 68515), (355, 57128), (370, 54812), (386, 52540), (568, 35705), (710, 28564), (740, 27406), (772, 26270), (965, 21016), (1420, 14282), (1480, 13703), (1544, 13135), (1930, 10508), (2627, 7720), (2840, 7141), (3860, 5254)]