21500220

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{103}}^1$

素因数の和:200

約数の個数: 144

約数和(自身を含む): 71705088

約数和(自身を除く): 50204868

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 71, 84, 98, 103, 105, 140, 142, 147, 196, 206, 210, 213, 245, 284, 294, 309, 355, 412, 420, 426, 490, 497, 515, 588, 618, 710, 721, 735, 852, 980, 994, 1030, 1065, 1236, 1420, 1442, 1470, 1491, 1545, 1988, 2060, 2130, 2163, 2485, 2884, 2940, 2982, 3090, 3479, 3605, 4260, 4326, 4970, 5047, 5964, 6180, 6958, 7210, 7313, 7455, 8652, 9940, 10094, 10437, 10815, 13916, 14420, 14626, 14910, 15141, 17395, 20188, 20874, 21630, 21939, 25235, 29252, 29820, 30282, 34790, 36565, 41748, 43260, 43878, 50470, 51191, 52185, 60564, 69580, 73130, 75705, 87756, 100940, 102382, 104370, 109695, 146260, 151410, 153573, 204764, 208740, 219390, 255955, 302820, 307146, 358337, 438780, 511910, 614292, 716674, 767865, 1023820, 1075011, 1433348, 1535730, 1791685, 2150022, 3071460, 3583370, 4300044, 5375055, 7166740, 10750110, 21500220]

約数ペア:

[(1, 21500220), (2, 10750110), (3, 7166740), (4, 5375055), (5, 4300044), (6, 3583370), (7, 3071460), (10, 2150022), (12, 1791685), (14, 1535730), (15, 1433348), (20, 1075011), (21, 1023820), (28, 767865), (30, 716674), (35, 614292), (42, 511910), (49, 438780), (60, 358337), (70, 307146), (71, 302820), (84, 255955), (98, 219390), (103, 208740), (105, 204764), (140, 153573), (142, 151410), (147, 146260), (196, 109695), (206, 104370), (210, 102382), (213, 100940), (245, 87756), (284, 75705), (294, 73130), (309, 69580), (355, 60564), (412, 52185), (420, 51191), (426, 50470), (490, 43878), (497, 43260), (515, 41748), (588, 36565), (618, 34790), (710, 30282), (721, 29820), (735, 29252), (852, 25235), (980, 21939), (994, 21630), (1030, 20874), (1065, 20188), (1236, 17395), (1420, 15141), (1442, 14910), (1470, 14626), (1491, 14420), (1545, 13916), (1988, 10815), (2060, 10437), (2130, 10094), (2163, 9940), (2485, 8652), (2884, 7455), (2940, 7313), (2982, 7210), (3090, 6958), (3479, 6180), (3605, 5964), (4260, 5047), (4326, 4970)]