18720225

素因数分解:

$3^2\times 5^2\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{151}}^1$

素因数の和:215

約数の個数: 72

約数和(自身を含む): 36753600

約数和(自身を除く): 18033375

約数列:

[1, 3, 5, 9, 15, 19, 25, 29, 45, 57, 75, 87, 95, 145, 151, 171, 225, 261, 285, 435, 453, 475, 551, 725, 755, 855, 1305, 1359, 1425, 1653, 2175, 2265, 2755, 2869, 3775, 4275, 4379, 4959, 6525, 6795, 8265, 8607, 11325, 13137, 13775, 14345, 21895, 24795, 25821, 33975, 39411, 41325, 43035, 65685, 71725, 83201, 109475, 123975, 129105, 197055, 215175, 249603, 328425, 416005, 645525, 748809, 985275, 1248015, 2080025, 3744045, 6240075, 18720225]

約数ペア:

[(1, 18720225), (3, 6240075), (5, 3744045), (9, 2080025), (15, 1248015), (19, 985275), (25, 748809), (29, 645525), (45, 416005), (57, 328425), (75, 249603), (87, 215175), (95, 197055), (145, 129105), (151, 123975), (171, 109475), (225, 83201), (261, 71725), (285, 65685), (435, 43035), (453, 41325), (475, 39411), (551, 33975), (725, 25821), (755, 24795), (855, 21895), (1305, 14345), (1359, 13775), (1425, 13137), (1653, 11325), (2175, 8607), (2265, 8265), (2755, 6795), (2869, 6525), (3775, 4959), (4275, 4379)]