20721855

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{11}}^2\times {\mathrm{233}}^1$

素因数の和:277

約数の個数: 72

約数和(自身を含む): 42574896

約数和(自身を除く): 21853041

約数列:

[1, 3, 5, 7, 11, 15, 21, 33, 35, 49, 55, 77, 105, 121, 147, 165, 231, 233, 245, 363, 385, 539, 605, 699, 735, 847, 1155, 1165, 1617, 1631, 1815, 2541, 2563, 2695, 3495, 4235, 4893, 5929, 7689, 8085, 8155, 11417, 12705, 12815, 17787, 17941, 24465, 28193, 29645, 34251, 38445, 53823, 57085, 84579, 88935, 89705, 125587, 140965, 171255, 197351, 269115, 376761, 422895, 592053, 627935, 986755, 1381457, 1883805, 2960265, 4144371, 6907285, 20721855]

約数ペア:

[(1, 20721855), (3, 6907285), (5, 4144371), (7, 2960265), (11, 1883805), (15, 1381457), (21, 986755), (33, 627935), (35, 592053), (49, 422895), (55, 376761), (77, 269115), (105, 197351), (121, 171255), (147, 140965), (165, 125587), (231, 89705), (233, 88935), (245, 84579), (363, 57085), (385, 53823), (539, 38445), (605, 34251), (699, 29645), (735, 28193), (847, 24465), (1155, 17941), (1165, 17787), (1617, 12815), (1631, 12705), (1815, 11417), (2541, 8155), (2563, 8085), (2695, 7689), (3495, 5929), (4235, 4893)]