21387540

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1\times {\mathrm{257}}^1$

素因数の和:361

約数の個数: 96

約数和(自身を含む): 64149120

約数和(自身を除く): 42761580

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 19, 20, 30, 38, 57, 60, 73, 76, 95, 114, 146, 190, 219, 228, 257, 285, 292, 365, 380, 438, 514, 570, 730, 771, 876, 1028, 1095, 1140, 1285, 1387, 1460, 1542, 2190, 2570, 2774, 3084, 3855, 4161, 4380, 4883, 5140, 5548, 6935, 7710, 8322, 9766, 13870, 14649, 15420, 16644, 18761, 19532, 20805, 24415, 27740, 29298, 37522, 41610, 48830, 56283, 58596, 73245, 75044, 83220, 93805, 97660, 112566, 146490, 187610, 225132, 281415, 292980, 356459, 375220, 562830, 712918, 1069377, 1125660, 1425836, 1782295, 2138754, 3564590, 4277508, 5346885, 7129180, 10693770, 21387540]

約数ペア:

[(1, 21387540), (2, 10693770), (3, 7129180), (4, 5346885), (5, 4277508), (6, 3564590), (10, 2138754), (12, 1782295), (15, 1425836), (19, 1125660), (20, 1069377), (30, 712918), (38, 562830), (57, 375220), (60, 356459), (73, 292980), (76, 281415), (95, 225132), (114, 187610), (146, 146490), (190, 112566), (219, 97660), (228, 93805), (257, 83220), (285, 75044), (292, 73245), (365, 58596), (380, 56283), (438, 48830), (514, 41610), (570, 37522), (730, 29298), (771, 27740), (876, 24415), (1028, 20805), (1095, 19532), (1140, 18761), (1285, 16644), (1387, 15420), (1460, 14649), (1542, 13870), (2190, 9766), (2570, 8322), (2774, 7710), (3084, 6935), (3855, 5548), (4161, 5140), (4380, 4883)]