19975005

素因数分解:

$3^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1$

素因数の和:128

約数の個数: 80

約数和(自身を含む): 38843904

約数和(自身を除く): 18868899

約数列:

[1, 3, 5, 9, 15, 27, 31, 37, 43, 45, 81, 93, 111, 129, 135, 155, 185, 215, 279, 333, 387, 405, 465, 555, 645, 837, 999, 1147, 1161, 1333, 1395, 1591, 1665, 1935, 2511, 2997, 3441, 3483, 3999, 4185, 4773, 4995, 5735, 5805, 6665, 7955, 10323, 11997, 12555, 14319, 14985, 17205, 17415, 19995, 23865, 30969, 35991, 42957, 49321, 51615, 59985, 71595, 92907, 107973, 128871, 147963, 154845, 179955, 214785, 246605, 443889, 464535, 539865, 644355, 739815, 1331667, 2219445, 3995001, 6658335, 19975005]

約数ペア:

[(1, 19975005), (3, 6658335), (5, 3995001), (9, 2219445), (15, 1331667), (27, 739815), (31, 644355), (37, 539865), (43, 464535), (45, 443889), (81, 246605), (93, 214785), (111, 179955), (129, 154845), (135, 147963), (155, 128871), (185, 107973), (215, 92907), (279, 71595), (333, 59985), (387, 51615), (405, 49321), (465, 42957), (555, 35991), (645, 30969), (837, 23865), (999, 19995), (1147, 17415), (1161, 17205), (1333, 14985), (1395, 14319), (1591, 12555), (1665, 11997), (1935, 10323), (2511, 7955), (2997, 6665), (3441, 5805), (3483, 5735), (3999, 4995), (4185, 4773)]