20999680

素因数分解:

$2^9\times 5^1\times {\mathrm{13}}^1\times {\mathrm{631}}^1$

素因数の和:667

約数の個数: 80

約数和(自身を含む): 54309024

約数和(自身を除く): 33309344

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, 512, 520, 631, 640, 832, 1040, 1262, 1280, 1664, 2080, 2524, 2560, 3155, 3328, 4160, 5048, 6310, 6656, 8203, 8320, 10096, 12620, 16406, 16640, 20192, 25240, 32812, 33280, 40384, 41015, 50480, 65624, 80768, 82030, 100960, 131248, 161536, 164060, 201920, 262496, 323072, 328120, 403840, 524992, 656240, 807680, 1049984, 1312480, 1615360, 2099968, 2624960, 4199936, 5249920, 10499840, 20999680]

約数ペア:

[(1, 20999680), (2, 10499840), (4, 5249920), (5, 4199936), (8, 2624960), (10, 2099968), (13, 1615360), (16, 1312480), (20, 1049984), (26, 807680), (32, 656240), (40, 524992), (52, 403840), (64, 328120), (65, 323072), (80, 262496), (104, 201920), (128, 164060), (130, 161536), (160, 131248), (208, 100960), (256, 82030), (260, 80768), (320, 65624), (416, 50480), (512, 41015), (520, 40384), (631, 33280), (640, 32812), (832, 25240), (1040, 20192), (1262, 16640), (1280, 16406), (1664, 12620), (2080, 10096), (2524, 8320), (2560, 8203), (3155, 6656), (3328, 6310), (4160, 5048)]