21217640

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{241}}^1$

素因数の和:354

約数の個数: 64

約数和(自身を含む): 50181120

約数和(自身を除く): 28963480

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 71, 124, 142, 155, 241, 248, 284, 310, 355, 482, 568, 620, 710, 964, 1205, 1240, 1420, 1928, 2201, 2410, 2840, 4402, 4820, 7471, 8804, 9640, 11005, 14942, 17111, 17608, 22010, 29884, 34222, 37355, 44020, 59768, 68444, 74710, 85555, 88040, 136888, 149420, 171110, 298840, 342220, 530441, 684440, 1060882, 2121764, 2652205, 4243528, 5304410, 10608820, 21217640]

約数ペア:

[(1, 21217640), (2, 10608820), (4, 5304410), (5, 4243528), (8, 2652205), (10, 2121764), (20, 1060882), (31, 684440), (40, 530441), (62, 342220), (71, 298840), (124, 171110), (142, 149420), (155, 136888), (241, 88040), (248, 85555), (284, 74710), (310, 68444), (355, 59768), (482, 44020), (568, 37355), (620, 34222), (710, 29884), (964, 22010), (1205, 17608), (1240, 17111), (1420, 14942), (1928, 11005), (2201, 9640), (2410, 8804), (2840, 7471), (4402, 4820)]