21351560

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1\times {\mathrm{257}}^1$

素因数の和:366

約数の個数: 64

約数和(自身を含む): 50526720

約数和(自身を除く): 29175160

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 67, 124, 134, 155, 248, 257, 268, 310, 335, 514, 536, 620, 670, 1028, 1240, 1285, 1340, 2056, 2077, 2570, 2680, 4154, 5140, 7967, 8308, 10280, 10385, 15934, 16616, 17219, 20770, 31868, 34438, 39835, 41540, 63736, 68876, 79670, 83080, 86095, 137752, 159340, 172190, 318680, 344380, 533789, 688760, 1067578, 2135156, 2668945, 4270312, 5337890, 10675780, 21351560]

約数ペア:

[(1, 21351560), (2, 10675780), (4, 5337890), (5, 4270312), (8, 2668945), (10, 2135156), (20, 1067578), (31, 688760), (40, 533789), (62, 344380), (67, 318680), (124, 172190), (134, 159340), (155, 137752), (248, 86095), (257, 83080), (268, 79670), (310, 68876), (335, 63736), (514, 41540), (536, 39835), (620, 34438), (670, 31868), (1028, 20770), (1240, 17219), (1285, 16616), (1340, 15934), (2056, 10385), (2077, 10280), (2570, 8308), (2680, 7967), (4154, 5140)]