21064875

素因数分解:

$3^1\times 5^3\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{149}}^1$

素因数の和:209

約数の個数: 64

約数和(自身を含む): 39312000

約数和(自身を除く): 18247125

約数列:

[1, 3, 5, 13, 15, 25, 29, 39, 65, 75, 87, 125, 145, 149, 195, 325, 375, 377, 435, 447, 725, 745, 975, 1131, 1625, 1885, 1937, 2175, 2235, 3625, 3725, 4321, 4875, 5655, 5811, 9425, 9685, 10875, 11175, 12963, 18625, 21605, 28275, 29055, 47125, 48425, 55875, 56173, 64815, 108025, 141375, 145275, 168519, 242125, 280865, 324075, 540125, 726375, 842595, 1404325, 1620375, 4212975, 7021625, 21064875]

約数ペア:

[(1, 21064875), (3, 7021625), (5, 4212975), (13, 1620375), (15, 1404325), (25, 842595), (29, 726375), (39, 540125), (65, 324075), (75, 280865), (87, 242125), (125, 168519), (145, 145275), (149, 141375), (195, 108025), (325, 64815), (375, 56173), (377, 55875), (435, 48425), (447, 47125), (725, 29055), (745, 28275), (975, 21605), (1131, 18625), (1625, 12963), (1885, 11175), (1937, 10875), (2175, 9685), (2235, 9425), (3625, 5811), (3725, 5655), (4321, 4875)]