21000280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{179}}^1\times {\mathrm{419}}^1$

素因数の和:616

約数の個数: 64

約数和(自身を含む): 54432000

約数和(自身を除く): 33431720

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 179, 280, 358, 419, 716, 838, 895, 1253, 1432, 1676, 1790, 2095, 2506, 2933, 3352, 3580, 4190, 5012, 5866, 6265, 7160, 8380, 10024, 11732, 12530, 14665, 16760, 23464, 25060, 29330, 50120, 58660, 75001, 117320, 150002, 300004, 375005, 525007, 600008, 750010, 1050014, 1500020, 2100028, 2625035, 3000040, 4200056, 5250070, 10500140, 21000280]

約数ペア:

[(1, 21000280), (2, 10500140), (4, 5250070), (5, 4200056), (7, 3000040), (8, 2625035), (10, 2100028), (14, 1500020), (20, 1050014), (28, 750010), (35, 600008), (40, 525007), (56, 375005), (70, 300004), (140, 150002), (179, 117320), (280, 75001), (358, 58660), (419, 50120), (716, 29330), (838, 25060), (895, 23464), (1253, 16760), (1432, 14665), (1676, 12530), (1790, 11732), (2095, 10024), (2506, 8380), (2933, 7160), (3352, 6265), (3580, 5866), (4190, 5012)]