21961640

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{199}}^1$

素因数の和:330

約数の個数: 64

約数和(自身を含む): 51840000

約数和(自身を除く): 29878360

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 89, 124, 155, 178, 199, 248, 310, 356, 398, 445, 620, 712, 796, 890, 995, 1240, 1592, 1780, 1990, 2759, 3560, 3980, 5518, 6169, 7960, 11036, 12338, 13795, 17711, 22072, 24676, 27590, 30845, 35422, 49352, 55180, 61690, 70844, 88555, 110360, 123380, 141688, 177110, 246760, 354220, 549041, 708440, 1098082, 2196164, 2745205, 4392328, 5490410, 10980820, 21961640]

約数ペア:

[(1, 21961640), (2, 10980820), (4, 5490410), (5, 4392328), (8, 2745205), (10, 2196164), (20, 1098082), (31, 708440), (40, 549041), (62, 354220), (89, 246760), (124, 177110), (155, 141688), (178, 123380), (199, 110360), (248, 88555), (310, 70844), (356, 61690), (398, 55180), (445, 49352), (620, 35422), (712, 30845), (796, 27590), (890, 24676), (995, 22072), (1240, 17711), (1592, 13795), (1780, 12338), (1990, 11036), (2759, 7960), (3560, 6169), (3980, 5518)]