19980675

素因数分解:

$3^5\times 5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1$

素因数の和:72

約数の個数: 144

約数和(自身を含む): 45497088

約数和(自身を除く): 25516413

約数列:

[1, 3, 5, 9, 11, 13, 15, 23, 25, 27, 33, 39, 45, 55, 65, 69, 75, 81, 99, 115, 117, 135, 143, 165, 195, 207, 225, 243, 253, 275, 297, 299, 325, 345, 351, 405, 429, 495, 575, 585, 621, 675, 715, 759, 825, 891, 897, 975, 1035, 1053, 1215, 1265, 1287, 1485, 1495, 1725, 1755, 1863, 2025, 2145, 2277, 2475, 2673, 2691, 2925, 3105, 3159, 3289, 3575, 3795, 3861, 4455, 4485, 5175, 5265, 5589, 6075, 6325, 6435, 6831, 7425, 7475, 8073, 8775, 9315, 9867, 10725, 11385, 11583, 13365, 13455, 15525, 15795, 16445, 18975, 19305, 20493, 22275, 22425, 24219, 26325, 27945, 29601, 32175, 34155, 34749, 40365, 46575, 49335, 56925, 57915, 61479, 66825, 67275, 72657, 78975, 82225, 88803, 96525, 102465, 121095, 139725, 148005, 170775, 173745, 201825, 246675, 266409, 289575, 307395, 363285, 444015, 512325, 605475, 740025, 799227, 868725, 1332045, 1536975, 1816425, 2220075, 3996135, 6660225, 19980675]

約数ペア:

[(1, 19980675), (3, 6660225), (5, 3996135), (9, 2220075), (11, 1816425), (13, 1536975), (15, 1332045), (23, 868725), (25, 799227), (27, 740025), (33, 605475), (39, 512325), (45, 444015), (55, 363285), (65, 307395), (69, 289575), (75, 266409), (81, 246675), (99, 201825), (115, 173745), (117, 170775), (135, 148005), (143, 139725), (165, 121095), (195, 102465), (207, 96525), (225, 88803), (243, 82225), (253, 78975), (275, 72657), (297, 67275), (299, 66825), (325, 61479), (345, 57915), (351, 56925), (405, 49335), (429, 46575), (495, 40365), (575, 34749), (585, 34155), (621, 32175), (675, 29601), (715, 27945), (759, 26325), (825, 24219), (891, 22425), (897, 22275), (975, 20493), (1035, 19305), (1053, 18975), (1215, 16445), (1265, 15795), (1287, 15525), (1485, 13455), (1495, 13365), (1725, 11583), (1755, 11385), (1863, 10725), (2025, 9867), (2145, 9315), (2277, 8775), (2475, 8073), (2673, 7475), (2691, 7425), (2925, 6831), (3105, 6435), (3159, 6325), (3289, 6075), (3575, 5589), (3795, 5265), (3861, 5175), (4455, 4485)]