21712821

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{41}}^1\times {\mathrm{367}}^1$

素因数の和:461

約数の個数: 32

約数和(自身を含む): 32890368

約数和(自身を除く): 11177547

約数列:

[1, 3, 13, 37, 39, 41, 111, 123, 367, 481, 533, 1101, 1443, 1517, 1599, 4551, 4771, 13579, 14313, 15047, 19721, 40737, 45141, 59163, 176527, 195611, 529581, 556739, 586833, 1670217, 7237607, 21712821]

約数ペア:

[(1, 21712821), (3, 7237607), (13, 1670217), (37, 586833), (39, 556739), (41, 529581), (111, 195611), (123, 176527), (367, 59163), (481, 45141), (533, 40737), (1101, 19721), (1443, 15047), (1517, 14313), (1599, 13579), (4551, 4771)]