21787240

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{239}}^1$

素因数の和:346

約数の個数: 64

約数和(自身を含む): 51321600

約数和(自身を除く): 29534360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 53, 86, 106, 172, 212, 215, 239, 265, 344, 424, 430, 478, 530, 860, 956, 1060, 1195, 1720, 1912, 2120, 2279, 2390, 4558, 4780, 9116, 9560, 10277, 11395, 12667, 18232, 20554, 22790, 25334, 41108, 45580, 50668, 51385, 63335, 82216, 91160, 101336, 102770, 126670, 205540, 253340, 411080, 506680, 544681, 1089362, 2178724, 2723405, 4357448, 5446810, 10893620, 21787240]

約数ペア:

[(1, 21787240), (2, 10893620), (4, 5446810), (5, 4357448), (8, 2723405), (10, 2178724), (20, 1089362), (40, 544681), (43, 506680), (53, 411080), (86, 253340), (106, 205540), (172, 126670), (212, 102770), (215, 101336), (239, 91160), (265, 82216), (344, 63335), (424, 51385), (430, 50668), (478, 45580), (530, 41108), (860, 25334), (956, 22790), (1060, 20554), (1195, 18232), (1720, 12667), (1912, 11395), (2120, 10277), (2279, 9560), (2390, 9116), (4558, 4780)]