21780990

素因数分解:

$2^1\times 3^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{449}}^1$

素因数の和:487

約数の個数: 144

約数和(自身を含む): 72025200

約数和(自身を除く): 50244210

約数列:

[1, 2, 3, 5, 6, 7, 9, 10, 11, 14, 15, 18, 21, 22, 30, 33, 35, 42, 45, 49, 55, 63, 66, 70, 77, 90, 98, 99, 105, 110, 126, 147, 154, 165, 198, 210, 231, 245, 294, 315, 330, 385, 441, 449, 462, 490, 495, 539, 630, 693, 735, 770, 882, 898, 990, 1078, 1155, 1347, 1386, 1470, 1617, 2205, 2245, 2310, 2694, 2695, 3143, 3234, 3465, 4041, 4410, 4490, 4851, 4939, 5390, 6286, 6735, 6930, 8082, 8085, 9429, 9702, 9878, 13470, 14817, 15715, 16170, 18858, 20205, 22001, 24255, 24695, 28287, 29634, 31430, 34573, 40410, 44002, 44451, 47145, 48510, 49390, 56574, 66003, 69146, 74085, 88902, 94290, 103719, 110005, 132006, 141435, 148170, 172865, 198009, 207438, 220010, 222255, 242011, 282870, 311157, 330015, 345730, 396018, 444510, 484022, 518595, 622314, 660030, 726033, 990045, 1037190, 1210055, 1452066, 1555785, 1980090, 2178099, 2420110, 3111570, 3630165, 4356198, 7260330, 10890495, 21780990]

約数ペア:

[(1, 21780990), (2, 10890495), (3, 7260330), (5, 4356198), (6, 3630165), (7, 3111570), (9, 2420110), (10, 2178099), (11, 1980090), (14, 1555785), (15, 1452066), (18, 1210055), (21, 1037190), (22, 990045), (30, 726033), (33, 660030), (35, 622314), (42, 518595), (45, 484022), (49, 444510), (55, 396018), (63, 345730), (66, 330015), (70, 311157), (77, 282870), (90, 242011), (98, 222255), (99, 220010), (105, 207438), (110, 198009), (126, 172865), (147, 148170), (154, 141435), (165, 132006), (198, 110005), (210, 103719), (231, 94290), (245, 88902), (294, 74085), (315, 69146), (330, 66003), (385, 56574), (441, 49390), (449, 48510), (462, 47145), (490, 44451), (495, 44002), (539, 40410), (630, 34573), (693, 31430), (735, 29634), (770, 28287), (882, 24695), (898, 24255), (990, 22001), (1078, 20205), (1155, 18858), (1347, 16170), (1386, 15715), (1470, 14817), (1617, 13470), (2205, 9878), (2245, 9702), (2310, 9429), (2694, 8085), (2695, 8082), (3143, 6930), (3234, 6735), (3465, 6286), (4041, 5390), (4410, 4939), (4490, 4851)]