21220017

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{4091}}^1$

素因数の和:4133

約数の個数: 32

約数和(自身を含む): 36664320

約数和(自身を除く): 15444303

約数列:

[1, 3, 7, 13, 19, 21, 39, 57, 91, 133, 247, 273, 399, 741, 1729, 4091, 5187, 12273, 28637, 53183, 77729, 85911, 159549, 233187, 372281, 544103, 1010477, 1116843, 1632309, 3031431, 7073339, 21220017]

約数ペア:

[(1, 21220017), (3, 7073339), (7, 3031431), (13, 1632309), (19, 1116843), (21, 1010477), (39, 544103), (57, 372281), (91, 233187), (133, 159549), (247, 85911), (273, 77729), (399, 53183), (741, 28637), (1729, 12273), (4091, 5187)]