21021780

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{26951}}^1$

素因数の和:26976

約数の個数: 48

約数和(自身を含む): 63391104

約数和(自身を除く): 42369324

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 26951, 53902, 80853, 107804, 134755, 161706, 269510, 323412, 350363, 404265, 539020, 700726, 808530, 1051089, 1401452, 1617060, 1751815, 2102178, 3503630, 4204356, 5255445, 7007260, 10510890, 21021780]

約数ペア:

[(1, 21021780), (2, 10510890), (3, 7007260), (4, 5255445), (5, 4204356), (6, 3503630), (10, 2102178), (12, 1751815), (13, 1617060), (15, 1401452), (20, 1051089), (26, 808530), (30, 700726), (39, 539020), (52, 404265), (60, 350363), (65, 323412), (78, 269510), (130, 161706), (156, 134755), (195, 107804), (260, 80853), (390, 53902), (780, 26951)]