20985705

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{1237}}^1$

素因数の和:1290

約数の個数: 48

約数和(自身を含む): 40556880

約数和(自身を除く): 19571175

約数列:

[1, 3, 5, 9, 13, 15, 29, 39, 45, 65, 87, 117, 145, 195, 261, 377, 435, 585, 1131, 1237, 1305, 1885, 3393, 3711, 5655, 6185, 11133, 16081, 16965, 18555, 35873, 48243, 55665, 80405, 107619, 144729, 179365, 241215, 322857, 466349, 538095, 723645, 1399047, 1614285, 2331745, 4197141, 6995235, 20985705]

約数ペア:

[(1, 20985705), (3, 6995235), (5, 4197141), (9, 2331745), (13, 1614285), (15, 1399047), (29, 723645), (39, 538095), (45, 466349), (65, 322857), (87, 241215), (117, 179365), (145, 144729), (195, 107619), (261, 80405), (377, 55665), (435, 48243), (585, 35873), (1131, 18555), (1237, 16965), (1305, 16081), (1885, 11133), (3393, 6185), (3711, 5655)]