21697520

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{673}}^1$

素因数の和:730

約数の個数: 80

約数和(自身を含む): 56163072

約数和(自身を除く): 34465552

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 31, 40, 52, 62, 65, 80, 104, 124, 130, 155, 208, 248, 260, 310, 403, 496, 520, 620, 673, 806, 1040, 1240, 1346, 1612, 2015, 2480, 2692, 3224, 3365, 4030, 5384, 6448, 6730, 8060, 8749, 10768, 13460, 16120, 17498, 20863, 26920, 32240, 34996, 41726, 43745, 53840, 69992, 83452, 87490, 104315, 139984, 166904, 174980, 208630, 271219, 333808, 349960, 417260, 542438, 699920, 834520, 1084876, 1356095, 1669040, 2169752, 2712190, 4339504, 5424380, 10848760, 21697520]

約数ペア:

[(1, 21697520), (2, 10848760), (4, 5424380), (5, 4339504), (8, 2712190), (10, 2169752), (13, 1669040), (16, 1356095), (20, 1084876), (26, 834520), (31, 699920), (40, 542438), (52, 417260), (62, 349960), (65, 333808), (80, 271219), (104, 208630), (124, 174980), (130, 166904), (155, 139984), (208, 104315), (248, 87490), (260, 83452), (310, 69992), (403, 53840), (496, 43745), (520, 41726), (620, 34996), (673, 32240), (806, 26920), (1040, 20863), (1240, 17498), (1346, 16120), (1612, 13460), (2015, 10768), (2480, 8749), (2692, 8060), (3224, 6730), (3365, 6448), (4030, 5384)]