20784640

素因数分解:

$2^9\times 5^1\times {\mathrm{23}}^1\times {\mathrm{353}}^1$

素因数の和:399

約数の個数: 80

約数和(自身を含む): 52148448

約数和(自身を除く): 31363808

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 32, 40, 46, 64, 80, 92, 115, 128, 160, 184, 230, 256, 320, 353, 368, 460, 512, 640, 706, 736, 920, 1280, 1412, 1472, 1765, 1840, 2560, 2824, 2944, 3530, 3680, 5648, 5888, 7060, 7360, 8119, 11296, 11776, 14120, 14720, 16238, 22592, 28240, 29440, 32476, 40595, 45184, 56480, 58880, 64952, 81190, 90368, 112960, 129904, 162380, 180736, 225920, 259808, 324760, 451840, 519616, 649520, 903680, 1039232, 1299040, 2078464, 2598080, 4156928, 5196160, 10392320, 20784640]

約数ペア:

[(1, 20784640), (2, 10392320), (4, 5196160), (5, 4156928), (8, 2598080), (10, 2078464), (16, 1299040), (20, 1039232), (23, 903680), (32, 649520), (40, 519616), (46, 451840), (64, 324760), (80, 259808), (92, 225920), (115, 180736), (128, 162380), (160, 129904), (184, 112960), (230, 90368), (256, 81190), (320, 64952), (353, 58880), (368, 56480), (460, 45184), (512, 40595), (640, 32476), (706, 29440), (736, 28240), (920, 22592), (1280, 16238), (1412, 14720), (1472, 14120), (1765, 11776), (1840, 11296), (2560, 8119), (2824, 7360), (2944, 7060), (3530, 5888), (3680, 5648)]