21218080

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{101}}^2$

素因数の和:230

約数の個数: 72

約数和(自身を含む): 54523476

約数和(自身を除く): 33305396

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 101, 104, 130, 160, 202, 208, 260, 404, 416, 505, 520, 808, 1010, 1040, 1313, 1616, 2020, 2080, 2626, 3232, 4040, 5252, 6565, 8080, 10201, 10504, 13130, 16160, 20402, 21008, 26260, 40804, 42016, 51005, 52520, 81608, 102010, 105040, 132613, 163216, 204020, 210080, 265226, 326432, 408040, 530452, 663065, 816080, 1060904, 1326130, 1632160, 2121808, 2652260, 4243616, 5304520, 10609040, 21218080]

約数ペア:

[(1, 21218080), (2, 10609040), (4, 5304520), (5, 4243616), (8, 2652260), (10, 2121808), (13, 1632160), (16, 1326130), (20, 1060904), (26, 816080), (32, 663065), (40, 530452), (52, 408040), (65, 326432), (80, 265226), (101, 210080), (104, 204020), (130, 163216), (160, 132613), (202, 105040), (208, 102010), (260, 81608), (404, 52520), (416, 51005), (505, 42016), (520, 40804), (808, 26260), (1010, 21008), (1040, 20402), (1313, 16160), (1616, 13130), (2020, 10504), (2080, 10201), (2626, 8080), (3232, 6565), (4040, 5252)]