20408895

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{401}}^1$

素因数の和:457

約数の個数: 64

約数和(自身を含む): 40521600

約数和(自身を除く): 20112705

約数列:

[1, 3, 5, 9, 13, 15, 27, 29, 39, 45, 65, 87, 117, 135, 145, 195, 261, 351, 377, 401, 435, 585, 783, 1131, 1203, 1305, 1755, 1885, 2005, 3393, 3609, 3915, 5213, 5655, 6015, 10179, 10827, 11629, 15639, 16965, 18045, 26065, 34887, 46917, 50895, 54135, 58145, 78195, 104661, 140751, 151177, 174435, 234585, 313983, 453531, 523305, 703755, 755885, 1360593, 1569915, 2267655, 4081779, 6802965, 20408895]

約数ペア:

[(1, 20408895), (3, 6802965), (5, 4081779), (9, 2267655), (13, 1569915), (15, 1360593), (27, 755885), (29, 703755), (39, 523305), (45, 453531), (65, 313983), (87, 234585), (117, 174435), (135, 151177), (145, 140751), (195, 104661), (261, 78195), (351, 58145), (377, 54135), (401, 50895), (435, 46917), (585, 34887), (783, 26065), (1131, 18045), (1203, 16965), (1305, 15639), (1755, 11629), (1885, 10827), (2005, 10179), (3393, 6015), (3609, 5655), (3915, 5213)]