21990640

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{107}}^1\times {\mathrm{367}}^1$

素因数の和:494

約数の個数: 80

約数和(自身を含む): 59139072

約数和(自身を除く): 37148432

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 107, 112, 140, 214, 280, 367, 428, 535, 560, 734, 749, 856, 1070, 1468, 1498, 1712, 1835, 2140, 2569, 2936, 2996, 3670, 3745, 4280, 5138, 5872, 5992, 7340, 7490, 8560, 10276, 11984, 12845, 14680, 14980, 20552, 25690, 29360, 29960, 39269, 41104, 51380, 59920, 78538, 102760, 157076, 196345, 205520, 274883, 314152, 392690, 549766, 628304, 785380, 1099532, 1374415, 1570760, 2199064, 2748830, 3141520, 4398128, 5497660, 10995320, 21990640]

約数ペア:

[(1, 21990640), (2, 10995320), (4, 5497660), (5, 4398128), (7, 3141520), (8, 2748830), (10, 2199064), (14, 1570760), (16, 1374415), (20, 1099532), (28, 785380), (35, 628304), (40, 549766), (56, 392690), (70, 314152), (80, 274883), (107, 205520), (112, 196345), (140, 157076), (214, 102760), (280, 78538), (367, 59920), (428, 51380), (535, 41104), (560, 39269), (734, 29960), (749, 29360), (856, 25690), (1070, 20552), (1468, 14980), (1498, 14680), (1712, 12845), (1835, 11984), (2140, 10276), (2569, 8560), (2936, 7490), (2996, 7340), (3670, 5992), (3745, 5872), (4280, 5138)]