20995840

素因数分解:

$2^8\times 5^1\times {\mathrm{47}}^1\times {\mathrm{349}}^1$

素因数の和:417

約数の個数: 72

約数和(自身を含む): 51508800

約数和(自身を除く): 30512960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 47, 64, 80, 94, 128, 160, 188, 235, 256, 320, 349, 376, 470, 640, 698, 752, 940, 1280, 1396, 1504, 1745, 1880, 2792, 3008, 3490, 3760, 5584, 6016, 6980, 7520, 11168, 12032, 13960, 15040, 16403, 22336, 27920, 30080, 32806, 44672, 55840, 60160, 65612, 82015, 89344, 111680, 131224, 164030, 223360, 262448, 328060, 446720, 524896, 656120, 1049792, 1312240, 2099584, 2624480, 4199168, 5248960, 10497920, 20995840]

約数ペア:

[(1, 20995840), (2, 10497920), (4, 5248960), (5, 4199168), (8, 2624480), (10, 2099584), (16, 1312240), (20, 1049792), (32, 656120), (40, 524896), (47, 446720), (64, 328060), (80, 262448), (94, 223360), (128, 164030), (160, 131224), (188, 111680), (235, 89344), (256, 82015), (320, 65612), (349, 60160), (376, 55840), (470, 44672), (640, 32806), (698, 30080), (752, 27920), (940, 22336), (1280, 16403), (1396, 15040), (1504, 13960), (1745, 12032), (1880, 11168), (2792, 7520), (3008, 6980), (3490, 6016), (3760, 5584)]