21282560

素因数分解:

$2^8\times 5^1\times {\mathrm{13}}^1\times {\mathrm{1279}}^1$

素因数の和:1313

約数の個数: 72

約数和(自身を含む): 54942720

約数和(自身を除く): 33660160

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 256, 260, 320, 416, 520, 640, 832, 1040, 1279, 1280, 1664, 2080, 2558, 3328, 4160, 5116, 6395, 8320, 10232, 12790, 16627, 16640, 20464, 25580, 33254, 40928, 51160, 66508, 81856, 83135, 102320, 133016, 163712, 166270, 204640, 266032, 327424, 332540, 409280, 532064, 665080, 818560, 1064128, 1330160, 1637120, 2128256, 2660320, 4256512, 5320640, 10641280, 21282560]

約数ペア:

[(1, 21282560), (2, 10641280), (4, 5320640), (5, 4256512), (8, 2660320), (10, 2128256), (13, 1637120), (16, 1330160), (20, 1064128), (26, 818560), (32, 665080), (40, 532064), (52, 409280), (64, 332540), (65, 327424), (80, 266032), (104, 204640), (128, 166270), (130, 163712), (160, 133016), (208, 102320), (256, 83135), (260, 81856), (320, 66508), (416, 51160), (520, 40928), (640, 33254), (832, 25580), (1040, 20464), (1279, 16640), (1280, 16627), (1664, 12790), (2080, 10232), (2558, 8320), (3328, 6395), (4160, 5116)]