19989501

素因数分解:

$3^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{421}}^1$

素因数の和:474

約数の個数: 48

約数和(自身を含む): 34637760

約数和(自身を除く): 14648259

約数列:

[1, 3, 7, 17, 19, 21, 49, 51, 57, 119, 133, 147, 323, 357, 399, 421, 833, 931, 969, 1263, 2261, 2499, 2793, 2947, 6783, 7157, 7999, 8841, 15827, 20629, 21471, 23997, 47481, 50099, 55993, 61887, 135983, 150297, 167979, 350693, 391951, 407949, 951881, 1052079, 1175853, 2855643, 6663167, 19989501]

約数ペア:

[(1, 19989501), (3, 6663167), (7, 2855643), (17, 1175853), (19, 1052079), (21, 951881), (49, 407949), (51, 391951), (57, 350693), (119, 167979), (133, 150297), (147, 135983), (323, 61887), (357, 55993), (399, 50099), (421, 47481), (833, 23997), (931, 21471), (969, 20629), (1263, 15827), (2261, 8841), (2499, 7999), (2793, 7157), (2947, 6783)]