21209301

素因数分解:

$3^2\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{4001}}^1$

素因数の和:4057

約数の個数: 24

約数和(自身を含む): 33296640

約数和(自身を除く): 12087339

約数列:

[1, 3, 9, 19, 31, 57, 93, 171, 279, 589, 1767, 4001, 5301, 12003, 36009, 76019, 124031, 228057, 372093, 684171, 1116279, 2356589, 7069767, 21209301]

約数ペア:

[(1, 21209301), (3, 7069767), (9, 2356589), (19, 1116279), (31, 684171), (57, 372093), (93, 228057), (171, 124031), (279, 76019), (589, 36009), (1767, 12003), (4001, 5301)]