21013720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{251}}^1$

素因数の和:305

約数の個数: 128

約数和(自身を含む): 60963840

約数和(自身を除く): 39950120

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 20, 23, 26, 28, 35, 40, 46, 52, 56, 65, 70, 91, 92, 104, 115, 130, 140, 161, 182, 184, 230, 251, 260, 280, 299, 322, 364, 455, 460, 502, 520, 598, 644, 728, 805, 910, 920, 1004, 1196, 1255, 1288, 1495, 1610, 1757, 1820, 2008, 2093, 2392, 2510, 2990, 3220, 3263, 3514, 3640, 4186, 5020, 5773, 5980, 6440, 6526, 7028, 8372, 8785, 10040, 10465, 11546, 11960, 13052, 14056, 16315, 16744, 17570, 20930, 22841, 23092, 26104, 28865, 32630, 35140, 40411, 41860, 45682, 46184, 57730, 65260, 70280, 75049, 80822, 83720, 91364, 114205, 115460, 130520, 150098, 161644, 182728, 202055, 228410, 230920, 300196, 323288, 375245, 404110, 456820, 525343, 600392, 750490, 808220, 913640, 1050686, 1500980, 1616440, 2101372, 2626715, 3001960, 4202744, 5253430, 10506860, 21013720]

約数ペア:

[(1, 21013720), (2, 10506860), (4, 5253430), (5, 4202744), (7, 3001960), (8, 2626715), (10, 2101372), (13, 1616440), (14, 1500980), (20, 1050686), (23, 913640), (26, 808220), (28, 750490), (35, 600392), (40, 525343), (46, 456820), (52, 404110), (56, 375245), (65, 323288), (70, 300196), (91, 230920), (92, 228410), (104, 202055), (115, 182728), (130, 161644), (140, 150098), (161, 130520), (182, 115460), (184, 114205), (230, 91364), (251, 83720), (260, 80822), (280, 75049), (299, 70280), (322, 65260), (364, 57730), (455, 46184), (460, 45682), (502, 41860), (520, 40411), (598, 35140), (644, 32630), (728, 28865), (805, 26104), (910, 23092), (920, 22841), (1004, 20930), (1196, 17570), (1255, 16744), (1288, 16315), (1495, 14056), (1610, 13052), (1757, 11960), (1820, 11546), (2008, 10465), (2093, 10040), (2392, 8785), (2510, 8372), (2990, 7028), (3220, 6526), (3263, 6440), (3514, 5980), (3640, 5773), (4186, 5020)]