19980405

素因数分解:

$3^3\times 5^1\times {\mathrm{47}}^2\times {\mathrm{67}}^1$

素因数の和:175

約数の個数: 48

約数和(自身を含む): 36834240

約数和(自身を除く): 16853835

約数列:

[1, 3, 5, 9, 15, 27, 45, 47, 67, 135, 141, 201, 235, 335, 423, 603, 705, 1005, 1269, 1809, 2115, 2209, 3015, 3149, 6345, 6627, 9045, 9447, 11045, 15745, 19881, 28341, 33135, 47235, 59643, 85023, 99405, 141705, 148003, 298215, 425115, 444009, 740015, 1332027, 2220045, 3996081, 6660135, 19980405]

約数ペア:

[(1, 19980405), (3, 6660135), (5, 3996081), (9, 2220045), (15, 1332027), (27, 740015), (45, 444009), (47, 425115), (67, 298215), (135, 148003), (141, 141705), (201, 99405), (235, 85023), (335, 59643), (423, 47235), (603, 33135), (705, 28341), (1005, 19881), (1269, 15745), (1809, 11045), (2115, 9447), (2209, 9045), (3015, 6627), (3149, 6345)]