21099975

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1$

素因数の和:129

約数の個数: 96

約数和(自身を含む): 42497280

約数和(自身を除く): 21397305

約数列:

[1, 3, 5, 13, 15, 17, 19, 25, 39, 51, 57, 65, 67, 75, 85, 95, 195, 201, 221, 247, 255, 285, 323, 325, 335, 425, 475, 663, 741, 871, 969, 975, 1005, 1105, 1139, 1235, 1273, 1275, 1425, 1615, 1675, 2613, 3315, 3417, 3705, 3819, 4199, 4355, 4845, 5025, 5525, 5695, 6175, 6365, 8075, 12597, 13065, 14807, 16549, 16575, 17085, 18525, 19095, 20995, 21641, 21775, 24225, 28475, 31825, 44421, 49647, 62985, 64923, 65325, 74035, 82745, 85425, 95475, 104975, 108205, 222105, 248235, 281333, 314925, 324615, 370175, 413725, 541025, 843999, 1110525, 1241175, 1406665, 1623075, 4219995, 7033325, 21099975]

約数ペア:

[(1, 21099975), (3, 7033325), (5, 4219995), (13, 1623075), (15, 1406665), (17, 1241175), (19, 1110525), (25, 843999), (39, 541025), (51, 413725), (57, 370175), (65, 324615), (67, 314925), (75, 281333), (85, 248235), (95, 222105), (195, 108205), (201, 104975), (221, 95475), (247, 85425), (255, 82745), (285, 74035), (323, 65325), (325, 64923), (335, 62985), (425, 49647), (475, 44421), (663, 31825), (741, 28475), (871, 24225), (969, 21775), (975, 21641), (1005, 20995), (1105, 19095), (1139, 18525), (1235, 17085), (1273, 16575), (1275, 16549), (1425, 14807), (1615, 13065), (1675, 12597), (2613, 8075), (3315, 6365), (3417, 6175), (3705, 5695), (3819, 5525), (4199, 5025), (4355, 4845)]