21501340

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{109}}^1\times {\mathrm{1409}}^1$

素因数の和:1534

約数の個数: 48

約数和(自身を含む): 52113600

約数和(自身を除く): 30612260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 109, 140, 218, 436, 545, 763, 1090, 1409, 1526, 2180, 2818, 3052, 3815, 5636, 7045, 7630, 9863, 14090, 15260, 19726, 28180, 39452, 49315, 98630, 153581, 197260, 307162, 614324, 767905, 1075067, 1535810, 2150134, 3071620, 4300268, 5375335, 10750670, 21501340]

約数ペア:

[(1, 21501340), (2, 10750670), (4, 5375335), (5, 4300268), (7, 3071620), (10, 2150134), (14, 1535810), (20, 1075067), (28, 767905), (35, 614324), (70, 307162), (109, 197260), (140, 153581), (218, 98630), (436, 49315), (545, 39452), (763, 28180), (1090, 19726), (1409, 15260), (1526, 14090), (2180, 9863), (2818, 7630), (3052, 7045), (3815, 5636)]