21097720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{151}}^1\times {\mathrm{499}}^1$

素因数の和:668

約数の個数: 64

約数和(自身を含む): 54720000

約数和(自身を除く): 33622280

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 151, 280, 302, 499, 604, 755, 998, 1057, 1208, 1510, 1996, 2114, 2495, 3020, 3493, 3992, 4228, 4990, 5285, 6040, 6986, 8456, 9980, 10570, 13972, 17465, 19960, 21140, 27944, 34930, 42280, 69860, 75349, 139720, 150698, 301396, 376745, 527443, 602792, 753490, 1054886, 1506980, 2109772, 2637215, 3013960, 4219544, 5274430, 10548860, 21097720]

約数ペア:

[(1, 21097720), (2, 10548860), (4, 5274430), (5, 4219544), (7, 3013960), (8, 2637215), (10, 2109772), (14, 1506980), (20, 1054886), (28, 753490), (35, 602792), (40, 527443), (56, 376745), (70, 301396), (140, 150698), (151, 139720), (280, 75349), (302, 69860), (499, 42280), (604, 34930), (755, 27944), (998, 21140), (1057, 19960), (1208, 17465), (1510, 13972), (1996, 10570), (2114, 9980), (2495, 8456), (3020, 6986), (3493, 6040), (3992, 5285), (4228, 4990)]