21043815

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{311}}^1\times {\mathrm{347}}^1$

素因数の和:679

約数の個数: 32

約数和(自身を含む): 36481536

約数和(自身を除く): 15437721

約数列:

[1, 3, 5, 13, 15, 39, 65, 195, 311, 347, 933, 1041, 1555, 1735, 4043, 4511, 4665, 5205, 12129, 13533, 20215, 22555, 60645, 67665, 107917, 323751, 539585, 1402921, 1618755, 4208763, 7014605, 21043815]

約数ペア:

[(1, 21043815), (3, 7014605), (5, 4208763), (13, 1618755), (15, 1402921), (39, 539585), (65, 323751), (195, 107917), (311, 67665), (347, 60645), (933, 22555), (1041, 20215), (1555, 13533), (1735, 12129), (4043, 5205), (4511, 4665)]