20910920

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{199}}^1$

素因数の和:318

約数の個数: 64

約数和(自身を含む): 49248000

約数和(自身を除く): 28337080

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 71, 74, 142, 148, 185, 199, 284, 296, 355, 370, 398, 568, 710, 740, 796, 995, 1420, 1480, 1592, 1990, 2627, 2840, 3980, 5254, 7363, 7960, 10508, 13135, 14129, 14726, 21016, 26270, 28258, 29452, 36815, 52540, 56516, 58904, 70645, 73630, 105080, 113032, 141290, 147260, 282580, 294520, 522773, 565160, 1045546, 2091092, 2613865, 4182184, 5227730, 10455460, 20910920]

約数ペア:

[(1, 20910920), (2, 10455460), (4, 5227730), (5, 4182184), (8, 2613865), (10, 2091092), (20, 1045546), (37, 565160), (40, 522773), (71, 294520), (74, 282580), (142, 147260), (148, 141290), (185, 113032), (199, 105080), (284, 73630), (296, 70645), (355, 58904), (370, 56516), (398, 52540), (568, 36815), (710, 29452), (740, 28258), (796, 26270), (995, 21016), (1420, 14726), (1480, 14129), (1592, 13135), (1990, 10508), (2627, 7960), (2840, 7363), (3980, 5254)]