20781216

素因数分解:

$2^5\times 3^2\times {\mathrm{59}}^1\times {\mathrm{1223}}^1$

素因数の和:1298

約数の個数: 72

約数和(自身を含む): 60147360

約数和(自身を除く): 39366144

約数列:

[1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 32, 36, 48, 59, 72, 96, 118, 144, 177, 236, 288, 354, 472, 531, 708, 944, 1062, 1223, 1416, 1888, 2124, 2446, 2832, 3669, 4248, 4892, 5664, 7338, 8496, 9784, 11007, 14676, 16992, 19568, 22014, 29352, 39136, 44028, 58704, 72157, 88056, 117408, 144314, 176112, 216471, 288628, 352224, 432942, 577256, 649413, 865884, 1154512, 1298826, 1731768, 2309024, 2597652, 3463536, 5195304, 6927072, 10390608, 20781216]

約数ペア:

[(1, 20781216), (2, 10390608), (3, 6927072), (4, 5195304), (6, 3463536), (8, 2597652), (9, 2309024), (12, 1731768), (16, 1298826), (18, 1154512), (24, 865884), (32, 649413), (36, 577256), (48, 432942), (59, 352224), (72, 288628), (96, 216471), (118, 176112), (144, 144314), (177, 117408), (236, 88056), (288, 72157), (354, 58704), (472, 44028), (531, 39136), (708, 29352), (944, 22014), (1062, 19568), (1223, 16992), (1416, 14676), (1888, 11007), (2124, 9784), (2446, 8496), (2832, 7338), (3669, 5664), (4248, 4892)]