21405125

素因数分解:

$5^3\times 7^1\times {\mathrm{17}}^1\times {\mathrm{1439}}^1$

素因数の和:1478

約数の個数: 32

約数和(自身を含む): 32348160

約数和(自身を除く): 10943035

約数列:

[1, 5, 7, 17, 25, 35, 85, 119, 125, 175, 425, 595, 875, 1439, 2125, 2975, 7195, 10073, 14875, 24463, 35975, 50365, 122315, 171241, 179875, 251825, 611575, 856205, 1259125, 3057875, 4281025, 21405125]

約数ペア:

[(1, 21405125), (5, 4281025), (7, 3057875), (17, 1259125), (25, 856205), (35, 611575), (85, 251825), (119, 179875), (125, 171241), (175, 122315), (425, 50365), (595, 35975), (875, 24463), (1439, 14875), (2125, 10073), (2975, 7195)]