21369915

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{179}}^1\times {\mathrm{379}}^1$

素因数の和:576

約数の個数: 48

約数和(自身を含む): 42681600

約数和(自身を除く): 21311685

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 179, 315, 379, 537, 895, 1137, 1253, 1611, 1895, 2653, 2685, 3411, 3759, 5685, 6265, 7959, 8055, 11277, 13265, 17055, 18795, 23877, 39795, 56385, 67841, 119385, 203523, 339205, 474887, 610569, 1017615, 1424661, 2374435, 3052845, 4273983, 7123305, 21369915]

約数ペア:

[(1, 21369915), (3, 7123305), (5, 4273983), (7, 3052845), (9, 2374435), (15, 1424661), (21, 1017615), (35, 610569), (45, 474887), (63, 339205), (105, 203523), (179, 119385), (315, 67841), (379, 56385), (537, 39795), (895, 23877), (1137, 18795), (1253, 17055), (1611, 13265), (1895, 11277), (2653, 8055), (2685, 7959), (3411, 6265), (3759, 5685)]