21270520

素因数分解:

$2^3\times 5^1\times {\mathrm{389}}^1\times {\mathrm{1367}}^1$

素因数の和:1767

約数の個数: 32

約数和(自身を含む): 48016800

約数和(自身を除く): 26746280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 389, 778, 1367, 1556, 1945, 2734, 3112, 3890, 5468, 6835, 7780, 10936, 13670, 15560, 27340, 54680, 531763, 1063526, 2127052, 2658815, 4254104, 5317630, 10635260, 21270520]

約数ペア:

[(1, 21270520), (2, 10635260), (4, 5317630), (5, 4254104), (8, 2658815), (10, 2127052), (20, 1063526), (40, 531763), (389, 54680), (778, 27340), (1367, 15560), (1556, 13670), (1945, 10936), (2734, 7780), (3112, 6835), (3890, 5468)]