21298705

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{59}}^1\times {\mathrm{137}}^1$

素因数の和:249

約数の個数: 32

約数和(自身を含む): 28615680

約数和(自身を除く): 7316975

約数列:

[1, 5, 17, 31, 59, 85, 137, 155, 295, 527, 685, 1003, 1829, 2329, 2635, 4247, 5015, 8083, 9145, 11645, 21235, 31093, 40415, 72199, 137411, 155465, 250573, 360995, 687055, 1252865, 4259741, 21298705]

約数ペア:

[(1, 21298705), (5, 4259741), (17, 1252865), (31, 687055), (59, 360995), (85, 250573), (137, 155465), (155, 137411), (295, 72199), (527, 40415), (685, 31093), (1003, 21235), (1829, 11645), (2329, 9145), (2635, 8083), (4247, 5015)]