19997978

素因数分解:

$2^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{1427}}^1$

素因数の和:1467

約数の個数: 48

約数和(自身を含む): 41023584

約数和(自身を除く): 21025606

約数列:

[1, 2, 7, 11, 13, 14, 22, 26, 49, 77, 91, 98, 143, 154, 182, 286, 539, 637, 1001, 1078, 1274, 1427, 2002, 2854, 7007, 9989, 14014, 15697, 18551, 19978, 31394, 37102, 69923, 109879, 129857, 139846, 204061, 219758, 259714, 408122, 769153, 908999, 1428427, 1538306, 1817998, 2856854, 9998989, 19997978]

約数ペア:

[(1, 19997978), (2, 9998989), (7, 2856854), (11, 1817998), (13, 1538306), (14, 1428427), (22, 908999), (26, 769153), (49, 408122), (77, 259714), (91, 219758), (98, 204061), (143, 139846), (154, 129857), (182, 109879), (286, 69923), (539, 37102), (637, 31394), (1001, 19978), (1078, 18551), (1274, 15697), (1427, 14014), (2002, 9989), (2854, 7007)]