19981980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{3581}}^1$

素因数の和:3627

約数の個数: 72

約数和(自身を含む): 62584704

約数和(自身を除く): 42602724

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 31, 36, 45, 60, 62, 90, 93, 124, 155, 180, 186, 279, 310, 372, 465, 558, 620, 930, 1116, 1395, 1860, 2790, 3581, 5580, 7162, 10743, 14324, 17905, 21486, 32229, 35810, 42972, 53715, 64458, 71620, 107430, 111011, 128916, 161145, 214860, 222022, 322290, 333033, 444044, 555055, 644580, 666066, 999099, 1110110, 1332132, 1665165, 1998198, 2220220, 3330330, 3996396, 4995495, 6660660, 9990990, 19981980]

約数ペア:

[(1, 19981980), (2, 9990990), (3, 6660660), (4, 4995495), (5, 3996396), (6, 3330330), (9, 2220220), (10, 1998198), (12, 1665165), (15, 1332132), (18, 1110110), (20, 999099), (30, 666066), (31, 644580), (36, 555055), (45, 444044), (60, 333033), (62, 322290), (90, 222022), (93, 214860), (124, 161145), (155, 128916), (180, 111011), (186, 107430), (279, 71620), (310, 64458), (372, 53715), (465, 42972), (558, 35810), (620, 32229), (930, 21486), (1116, 17905), (1395, 14324), (1860, 10743), (2790, 7162), (3581, 5580)]