19979820

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{101}}^1\times {\mathrm{157}}^1$

素因数の和:280

約数の個数: 144

約数和(自身を含む): 70394688

約数和(自身を除く): 50414868

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 101, 105, 126, 140, 157, 180, 202, 210, 252, 303, 314, 315, 404, 420, 471, 505, 606, 628, 630, 707, 785, 909, 942, 1010, 1099, 1212, 1260, 1413, 1414, 1515, 1570, 1818, 1884, 2020, 2121, 2198, 2355, 2826, 2828, 3030, 3140, 3297, 3535, 3636, 4242, 4396, 4545, 4710, 5495, 5652, 6060, 6363, 6594, 7065, 7070, 8484, 9090, 9420, 9891, 10605, 10990, 12726, 13188, 14130, 14140, 15857, 16485, 18180, 19782, 21210, 21980, 25452, 28260, 31714, 31815, 32970, 39564, 42420, 47571, 49455, 63428, 63630, 65940, 79285, 95142, 98910, 110999, 127260, 142713, 158570, 190284, 197820, 221998, 237855, 285426, 317140, 332997, 443996, 475710, 554995, 570852, 665994, 713565, 951420, 998991, 1109990, 1331988, 1427130, 1664985, 1997982, 2219980, 2854260, 3329970, 3995964, 4994955, 6659940, 9989910, 19979820]

約数ペア:

[(1, 19979820), (2, 9989910), (3, 6659940), (4, 4994955), (5, 3995964), (6, 3329970), (7, 2854260), (9, 2219980), (10, 1997982), (12, 1664985), (14, 1427130), (15, 1331988), (18, 1109990), (20, 998991), (21, 951420), (28, 713565), (30, 665994), (35, 570852), (36, 554995), (42, 475710), (45, 443996), (60, 332997), (63, 317140), (70, 285426), (84, 237855), (90, 221998), (101, 197820), (105, 190284), (126, 158570), (140, 142713), (157, 127260), (180, 110999), (202, 98910), (210, 95142), (252, 79285), (303, 65940), (314, 63630), (315, 63428), (404, 49455), (420, 47571), (471, 42420), (505, 39564), (606, 32970), (628, 31815), (630, 31714), (707, 28260), (785, 25452), (909, 21980), (942, 21210), (1010, 19782), (1099, 18180), (1212, 16485), (1260, 15857), (1413, 14140), (1414, 14130), (1515, 13188), (1570, 12726), (1818, 10990), (1884, 10605), (2020, 9891), (2121, 9420), (2198, 9090), (2355, 8484), (2826, 7070), (2828, 7065), (3030, 6594), (3140, 6363), (3297, 6060), (3535, 5652), (3636, 5495), (4242, 4710), (4396, 4545)]