21787805

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{4243}}^1$

素因数の和:4340

約数の個数: 16

約数和(自身を含む): 28519680

約数和(自身を除く): 6731875

約数列:

[1, 5, 13, 65, 79, 395, 1027, 4243, 5135, 21215, 55159, 275795, 335197, 1675985, 4357561, 21787805]

約数ペア:

[(1, 21787805), (5, 4357561), (13, 1675985), (65, 335197), (79, 275795), (395, 55159), (1027, 21215), (4243, 5135)]