21017228225

素因数分解:

$5^2\times 7^2\times {\mathrm{61}}^1\times {\mathrm{137}}^1\times {\mathrm{2053}}^1$

素因数の和:2275

約数の個数: 72

約数和(自身を含む): 31053300408

約数和(自身を除く): 10036072183

約数列:

[1, 5, 7, 25, 35, 49, 61, 137, 175, 245, 305, 427, 685, 959, 1225, 1525, 2053, 2135, 2989, 3425, 4795, 6713, 8357, 10265, 10675, 14371, 14945, 23975, 33565, 41785, 51325, 58499, 71855, 74725, 100597, 125233, 167825, 208925, 281261, 292495, 359275, 409493, 502985, 626165, 876631, 1406305, 1462475, 1968827, 2047465, 2514925, 3130825, 4383155, 6136417, 7031525, 9844135, 10237325, 13781789, 17156921, 21915775, 30682085, 49220675, 68908945, 85784605, 120098447, 153410425, 344544725, 428923025, 600492235, 840689129, 3002461175, 4203445645, 21017228225]

約数ペア:

[(1, 21017228225), (5, 4203445645), (7, 3002461175), (25, 840689129), (35, 600492235), (49, 428923025), (61, 344544725), (137, 153410425), (175, 120098447), (245, 85784605), (305, 68908945), (427, 49220675), (685, 30682085), (959, 21915775), (1225, 17156921), (1525, 13781789), (2053, 10237325), (2135, 9844135), (2989, 7031525), (3425, 6136417), (4795, 4383155), (6713, 3130825), (8357, 2514925), (10265, 2047465), (10675, 1968827), (14371, 1462475), (14945, 1406305), (23975, 876631), (33565, 626165), (41785, 502985), (51325, 409493), (58499, 359275), (71855, 292495), (74725, 281261), (100597, 208925), (125233, 167825)]