20499440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{857}}^1$

素因数の和:906

約数の個数: 80

約数和(自身を含む): 53621568

約数和(自身を除く): 33122128

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 23, 26, 40, 46, 52, 65, 80, 92, 104, 115, 130, 184, 208, 230, 260, 299, 368, 460, 520, 598, 857, 920, 1040, 1196, 1495, 1714, 1840, 2392, 2990, 3428, 4285, 4784, 5980, 6856, 8570, 11141, 11960, 13712, 17140, 19711, 22282, 23920, 34280, 39422, 44564, 55705, 68560, 78844, 89128, 98555, 111410, 157688, 178256, 197110, 222820, 256243, 315376, 394220, 445640, 512486, 788440, 891280, 1024972, 1281215, 1576880, 2049944, 2562430, 4099888, 5124860, 10249720, 20499440]

約数ペア:

[(1, 20499440), (2, 10249720), (4, 5124860), (5, 4099888), (8, 2562430), (10, 2049944), (13, 1576880), (16, 1281215), (20, 1024972), (23, 891280), (26, 788440), (40, 512486), (46, 445640), (52, 394220), (65, 315376), (80, 256243), (92, 222820), (104, 197110), (115, 178256), (130, 157688), (184, 111410), (208, 98555), (230, 89128), (260, 78844), (299, 68560), (368, 55705), (460, 44564), (520, 39422), (598, 34280), (857, 23920), (920, 22282), (1040, 19711), (1196, 17140), (1495, 13712), (1714, 11960), (1840, 11141), (2392, 8570), (2990, 6856), (3428, 5980), (4285, 4784)]