21000643209

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{103813}}^1$

素因数の和:103871

約数の個数: 72

約数和(自身を含む): 39515760960

約数和(自身を除く): 18515117751

約数列:

[1, 3, 7, 9, 13, 19, 21, 39, 57, 63, 91, 117, 133, 169, 171, 247, 273, 399, 507, 741, 819, 1183, 1197, 1521, 1729, 2223, 3211, 3549, 5187, 9633, 10647, 15561, 22477, 28899, 67431, 103813, 202293, 311439, 726691, 934317, 1349569, 1972447, 2180073, 4048707, 5917341, 6540219, 9446983, 12146121, 13807129, 17544397, 17752023, 25641811, 28340949, 41421387, 52633191, 76925433, 85022847, 122810779, 124264161, 157899573, 179492677, 230776299, 333343543, 368432337, 538478031, 1000030629, 1105297011, 1615434093, 2333404801, 3000091887, 7000214403, 21000643209]

約数ペア:

[(1, 21000643209), (3, 7000214403), (7, 3000091887), (9, 2333404801), (13, 1615434093), (19, 1105297011), (21, 1000030629), (39, 538478031), (57, 368432337), (63, 333343543), (91, 230776299), (117, 179492677), (133, 157899573), (169, 124264161), (171, 122810779), (247, 85022847), (273, 76925433), (399, 52633191), (507, 41421387), (741, 28340949), (819, 25641811), (1183, 17752023), (1197, 17544397), (1521, 13807129), (1729, 12146121), (2223, 9446983), (3211, 6540219), (3549, 5917341), (5187, 4048707), (9633, 2180073), (10647, 1972447), (15561, 1349569), (22477, 934317), (28899, 726691), (67431, 311439), (103813, 202293)]