20913280

素因数分解:

$2^7\times 5^1\times {\mathrm{41}}^1\times {\mathrm{797}}^1$

素因数の和:857

約数の個数: 64

約数和(自身を含む): 51279480

約数和(自身を除く): 30366200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 41, 64, 80, 82, 128, 160, 164, 205, 320, 328, 410, 640, 656, 797, 820, 1312, 1594, 1640, 2624, 3188, 3280, 3985, 5248, 6376, 6560, 7970, 12752, 13120, 15940, 25504, 26240, 31880, 32677, 51008, 63760, 65354, 102016, 127520, 130708, 163385, 255040, 261416, 326770, 510080, 522832, 653540, 1045664, 1307080, 2091328, 2614160, 4182656, 5228320, 10456640, 20913280]

約数ペア:

[(1, 20913280), (2, 10456640), (4, 5228320), (5, 4182656), (8, 2614160), (10, 2091328), (16, 1307080), (20, 1045664), (32, 653540), (40, 522832), (41, 510080), (64, 326770), (80, 261416), (82, 255040), (128, 163385), (160, 130708), (164, 127520), (205, 102016), (320, 65354), (328, 63760), (410, 51008), (640, 32677), (656, 31880), (797, 26240), (820, 25504), (1312, 15940), (1594, 13120), (1640, 12752), (2624, 7970), (3188, 6560), (3280, 6376), (3985, 5248)]