20919500

素因数分解:

$2^2\times 5^3\times 7^1\times {\mathrm{43}}^1\times {\mathrm{139}}^1$

素因数の和:208

約数の個数: 96

約数和(自身を含む): 53813760

約数和(自身を除く): 32894260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 25, 28, 35, 43, 50, 70, 86, 100, 125, 139, 140, 172, 175, 215, 250, 278, 301, 350, 430, 500, 556, 602, 695, 700, 860, 875, 973, 1075, 1204, 1390, 1505, 1750, 1946, 2150, 2780, 3010, 3475, 3500, 3892, 4300, 4865, 5375, 5977, 6020, 6950, 7525, 9730, 10750, 11954, 13900, 15050, 17375, 19460, 21500, 23908, 24325, 29885, 30100, 34750, 37625, 41839, 48650, 59770, 69500, 75250, 83678, 97300, 119540, 121625, 149425, 150500, 167356, 209195, 243250, 298850, 418390, 486500, 597700, 747125, 836780, 1045975, 1494250, 2091950, 2988500, 4183900, 5229875, 10459750, 20919500]

約数ペア:

[(1, 20919500), (2, 10459750), (4, 5229875), (5, 4183900), (7, 2988500), (10, 2091950), (14, 1494250), (20, 1045975), (25, 836780), (28, 747125), (35, 597700), (43, 486500), (50, 418390), (70, 298850), (86, 243250), (100, 209195), (125, 167356), (139, 150500), (140, 149425), (172, 121625), (175, 119540), (215, 97300), (250, 83678), (278, 75250), (301, 69500), (350, 59770), (430, 48650), (500, 41839), (556, 37625), (602, 34750), (695, 30100), (700, 29885), (860, 24325), (875, 23908), (973, 21500), (1075, 19460), (1204, 17375), (1390, 15050), (1505, 13900), (1750, 11954), (1946, 10750), (2150, 9730), (2780, 7525), (3010, 6950), (3475, 6020), (3500, 5977), (3892, 5375), (4300, 4865)]