21990990

素因数分解:

$2^1\times 3^1\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{157}}^1$

素因数の和:226

約数の個数: 128

約数和(自身を含む): 65525760

約数和(自身を除く): 43534770

約数列:

[1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 23, 29, 30, 35, 42, 46, 58, 69, 70, 87, 105, 115, 138, 145, 157, 161, 174, 203, 210, 230, 290, 314, 322, 345, 406, 435, 471, 483, 609, 667, 690, 785, 805, 870, 942, 966, 1015, 1099, 1218, 1334, 1570, 1610, 2001, 2030, 2198, 2355, 2415, 3045, 3297, 3335, 3611, 4002, 4553, 4669, 4710, 4830, 5495, 6090, 6594, 6670, 7222, 9106, 9338, 10005, 10833, 10990, 13659, 14007, 16485, 18055, 20010, 21666, 22765, 23345, 25277, 27318, 28014, 31871, 32970, 36110, 45530, 46690, 50554, 54165, 63742, 68295, 70035, 75831, 95613, 104719, 108330, 126385, 136590, 140070, 151662, 159355, 191226, 209438, 252770, 314157, 318710, 379155, 478065, 523595, 628314, 733033, 758310, 956130, 1047190, 1466066, 1570785, 2199099, 3141570, 3665165, 4398198, 7330330, 10995495, 21990990]

約数ペア:

[(1, 21990990), (2, 10995495), (3, 7330330), (5, 4398198), (6, 3665165), (7, 3141570), (10, 2199099), (14, 1570785), (15, 1466066), (21, 1047190), (23, 956130), (29, 758310), (30, 733033), (35, 628314), (42, 523595), (46, 478065), (58, 379155), (69, 318710), (70, 314157), (87, 252770), (105, 209438), (115, 191226), (138, 159355), (145, 151662), (157, 140070), (161, 136590), (174, 126385), (203, 108330), (210, 104719), (230, 95613), (290, 75831), (314, 70035), (322, 68295), (345, 63742), (406, 54165), (435, 50554), (471, 46690), (483, 45530), (609, 36110), (667, 32970), (690, 31871), (785, 28014), (805, 27318), (870, 25277), (942, 23345), (966, 22765), (1015, 21666), (1099, 20010), (1218, 18055), (1334, 16485), (1570, 14007), (1610, 13659), (2001, 10990), (2030, 10833), (2198, 10005), (2355, 9338), (2415, 9106), (3045, 7222), (3297, 6670), (3335, 6594), (3611, 6090), (4002, 5495), (4553, 4830), (4669, 4710)]