20320720

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{277}}^1$

素因数の和:428

約数の個数: 80

約数和(自身を含む): 54603648

約数和(自身を除く): 34282928

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 131, 140, 262, 277, 280, 524, 554, 560, 655, 917, 1048, 1108, 1310, 1385, 1834, 1939, 2096, 2216, 2620, 2770, 3668, 3878, 4432, 4585, 5240, 5540, 7336, 7756, 9170, 9695, 10480, 11080, 14672, 15512, 18340, 19390, 22160, 31024, 36287, 36680, 38780, 72574, 73360, 77560, 145148, 155120, 181435, 254009, 290296, 362870, 508018, 580592, 725740, 1016036, 1270045, 1451480, 2032072, 2540090, 2902960, 4064144, 5080180, 10160360, 20320720]

約数ペア:

[(1, 20320720), (2, 10160360), (4, 5080180), (5, 4064144), (7, 2902960), (8, 2540090), (10, 2032072), (14, 1451480), (16, 1270045), (20, 1016036), (28, 725740), (35, 580592), (40, 508018), (56, 362870), (70, 290296), (80, 254009), (112, 181435), (131, 155120), (140, 145148), (262, 77560), (277, 73360), (280, 72574), (524, 38780), (554, 36680), (560, 36287), (655, 31024), (917, 22160), (1048, 19390), (1108, 18340), (1310, 15512), (1385, 14672), (1834, 11080), (1939, 10480), (2096, 9695), (2216, 9170), (2620, 7756), (2770, 7336), (3668, 5540), (3878, 5240), (4432, 4585)]