20898980

素因数分解:

$2^2\times 5^1\times {\mathrm{59}}^1\times {\mathrm{89}}^1\times {\mathrm{199}}^1$

素因数の和:356

約数の個数: 48

約数和(自身を含む): 45360000

約数和(自身を除く): 24461020

約数列:

[1, 2, 4, 5, 10, 20, 59, 89, 118, 178, 199, 236, 295, 356, 398, 445, 590, 796, 890, 995, 1180, 1780, 1990, 3980, 5251, 10502, 11741, 17711, 21004, 23482, 26255, 35422, 46964, 52510, 58705, 70844, 88555, 105020, 117410, 177110, 234820, 354220, 1044949, 2089898, 4179796, 5224745, 10449490, 20898980]

約数ペア:

[(1, 20898980), (2, 10449490), (4, 5224745), (5, 4179796), (10, 2089898), (20, 1044949), (59, 354220), (89, 234820), (118, 177110), (178, 117410), (199, 105020), (236, 88555), (295, 70844), (356, 58705), (398, 52510), (445, 46964), (590, 35422), (796, 26255), (890, 23482), (995, 21004), (1180, 17711), (1780, 11741), (1990, 10502), (3980, 5251)]