20921285

素因数分解:

$5^1\times 7^3\times {\mathrm{11}}^1\times {\mathrm{1109}}^1$

素因数の和:1146

約数の個数: 32

約数和(自身を含む): 31968000

約数和(自身を除く): 11046715

約数列:

[1, 5, 7, 11, 35, 49, 55, 77, 245, 343, 385, 539, 1109, 1715, 2695, 3773, 5545, 7763, 12199, 18865, 38815, 54341, 60995, 85393, 271705, 380387, 426965, 597751, 1901935, 2988755, 4184257, 20921285]

約数ペア:

[(1, 20921285), (5, 4184257), (7, 2988755), (11, 1901935), (35, 597751), (49, 426965), (55, 380387), (77, 271705), (245, 85393), (343, 60995), (385, 54341), (539, 38815), (1109, 18865), (1715, 12199), (2695, 7763), (3773, 5545)]