21805840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{1693}}^1$

素因数の和:1736

約数の個数: 80

約数和(自身を含む): 60496128

約数和(自身を除く): 38690288

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 23, 28, 35, 40, 46, 56, 70, 80, 92, 112, 115, 140, 161, 184, 230, 280, 322, 368, 460, 560, 644, 805, 920, 1288, 1610, 1693, 1840, 2576, 3220, 3386, 6440, 6772, 8465, 11851, 12880, 13544, 16930, 23702, 27088, 33860, 38939, 47404, 59255, 67720, 77878, 94808, 118510, 135440, 155756, 189616, 194695, 237020, 272573, 311512, 389390, 474040, 545146, 623024, 778780, 948080, 1090292, 1362865, 1557560, 2180584, 2725730, 3115120, 4361168, 5451460, 10902920, 21805840]

約数ペア:

[(1, 21805840), (2, 10902920), (4, 5451460), (5, 4361168), (7, 3115120), (8, 2725730), (10, 2180584), (14, 1557560), (16, 1362865), (20, 1090292), (23, 948080), (28, 778780), (35, 623024), (40, 545146), (46, 474040), (56, 389390), (70, 311512), (80, 272573), (92, 237020), (112, 194695), (115, 189616), (140, 155756), (161, 135440), (184, 118510), (230, 94808), (280, 77878), (322, 67720), (368, 59255), (460, 47404), (560, 38939), (644, 33860), (805, 27088), (920, 23702), (1288, 16930), (1610, 13544), (1693, 12880), (1840, 11851), (2576, 8465), (3220, 6772), (3386, 6440)]