21551205

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{103}}^1$

素因数の和:190

約数の個数: 64

約数和(自身を含む): 39836160

約数和(自身を除く): 18284955

約数列:

[1, 3, 5, 13, 15, 29, 37, 39, 65, 87, 103, 111, 145, 185, 195, 309, 377, 435, 481, 515, 555, 1073, 1131, 1339, 1443, 1545, 1885, 2405, 2987, 3219, 3811, 4017, 5365, 5655, 6695, 7215, 8961, 11433, 13949, 14935, 16095, 19055, 20085, 38831, 41847, 44805, 49543, 57165, 69745, 110519, 116493, 148629, 194155, 209235, 247715, 331557, 552595, 582465, 743145, 1436747, 1657785, 4310241, 7183735, 21551205]

約数ペア:

[(1, 21551205), (3, 7183735), (5, 4310241), (13, 1657785), (15, 1436747), (29, 743145), (37, 582465), (39, 552595), (65, 331557), (87, 247715), (103, 209235), (111, 194155), (145, 148629), (185, 116493), (195, 110519), (309, 69745), (377, 57165), (435, 49543), (481, 44805), (515, 41847), (555, 38831), (1073, 20085), (1131, 19055), (1339, 16095), (1443, 14935), (1545, 13949), (1885, 11433), (2405, 8961), (2987, 7215), (3219, 6695), (3811, 5655), (4017, 5365)]