640395

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{107}}^1$

素因数の和:144

約数の個数: 48

約数和(自身を含む): 1347840

約数和(自身を除く): 707445

約数列:

[1, 3, 5, 7, 9, 15, 19, 21, 35, 45, 57, 63, 95, 105, 107, 133, 171, 285, 315, 321, 399, 535, 665, 749, 855, 963, 1197, 1605, 1995, 2033, 2247, 3745, 4815, 5985, 6099, 6741, 10165, 11235, 14231, 18297, 30495, 33705, 42693, 71155, 91485, 128079, 213465, 640395]

約数ペア:

[(1, 640395), (3, 213465), (5, 128079), (7, 91485), (9, 71155), (15, 42693), (19, 33705), (21, 30495), (35, 18297), (45, 14231), (57, 11235), (63, 10165), (95, 6741), (105, 6099), (107, 5985), (133, 4815), (171, 3745), (285, 2247), (315, 2033), (321, 1995), (399, 1605), (535, 1197), (665, 963), (749, 855)]