20531980

素因数分解:

$2^2\times 5^1\times 7^3\times {\mathrm{41}}^1\times {\mathrm{73}}^1$

素因数の和:144

約数の個数: 96

約数和(自身を含む): 52214400

約数和(自身を除く): 31682420

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 41, 49, 70, 73, 82, 98, 140, 146, 164, 196, 205, 245, 287, 292, 343, 365, 410, 490, 511, 574, 686, 730, 820, 980, 1022, 1148, 1372, 1435, 1460, 1715, 2009, 2044, 2555, 2870, 2993, 3430, 3577, 4018, 5110, 5740, 5986, 6860, 7154, 8036, 10045, 10220, 11972, 14063, 14308, 14965, 17885, 20090, 20951, 25039, 28126, 29930, 35770, 40180, 41902, 50078, 56252, 59860, 70315, 71540, 83804, 100156, 104755, 125195, 140630, 146657, 209510, 250390, 281260, 293314, 419020, 500780, 586628, 733285, 1026599, 1466570, 2053198, 2933140, 4106396, 5132995, 10265990, 20531980]

約数ペア:

[(1, 20531980), (2, 10265990), (4, 5132995), (5, 4106396), (7, 2933140), (10, 2053198), (14, 1466570), (20, 1026599), (28, 733285), (35, 586628), (41, 500780), (49, 419020), (70, 293314), (73, 281260), (82, 250390), (98, 209510), (140, 146657), (146, 140630), (164, 125195), (196, 104755), (205, 100156), (245, 83804), (287, 71540), (292, 70315), (343, 59860), (365, 56252), (410, 50078), (490, 41902), (511, 40180), (574, 35770), (686, 29930), (730, 28126), (820, 25039), (980, 20951), (1022, 20090), (1148, 17885), (1372, 14965), (1435, 14308), (1460, 14063), (1715, 11972), (2009, 10220), (2044, 10045), (2555, 8036), (2870, 7154), (2993, 6860), (3430, 5986), (3577, 5740), (4018, 5110)]