20399925

素因数分解:

$3^1\times 5^2\times 7^3\times {\mathrm{13}}^1\times {\mathrm{61}}^1$

素因数の和:108

約数の個数: 96

約数和(自身を含む): 43052800

約数和(自身を除く): 22652875

約数列:

[1, 3, 5, 7, 13, 15, 21, 25, 35, 39, 49, 61, 65, 75, 91, 105, 147, 175, 183, 195, 245, 273, 305, 325, 343, 427, 455, 525, 637, 735, 793, 915, 975, 1029, 1225, 1281, 1365, 1525, 1715, 1911, 2135, 2275, 2379, 2989, 3185, 3675, 3965, 4459, 4575, 5145, 5551, 6405, 6825, 8575, 8967, 9555, 10675, 11895, 13377, 14945, 15925, 16653, 19825, 20923, 22295, 25725, 27755, 32025, 38857, 44835, 47775, 59475, 62769, 66885, 74725, 83265, 104615, 111475, 116571, 138775, 194285, 224175, 271999, 313845, 334425, 416325, 523075, 582855, 815997, 971425, 1359995, 1569225, 2914275, 4079985, 6799975, 20399925]

約数ペア:

[(1, 20399925), (3, 6799975), (5, 4079985), (7, 2914275), (13, 1569225), (15, 1359995), (21, 971425), (25, 815997), (35, 582855), (39, 523075), (49, 416325), (61, 334425), (65, 313845), (75, 271999), (91, 224175), (105, 194285), (147, 138775), (175, 116571), (183, 111475), (195, 104615), (245, 83265), (273, 74725), (305, 66885), (325, 62769), (343, 59475), (427, 47775), (455, 44835), (525, 38857), (637, 32025), (735, 27755), (793, 25725), (915, 22295), (975, 20923), (1029, 19825), (1225, 16653), (1281, 15925), (1365, 14945), (1525, 13377), (1715, 11895), (1911, 10675), (2135, 9555), (2275, 8967), (2379, 8575), (2989, 6825), (3185, 6405), (3675, 5551), (3965, 5145), (4459, 4575)]