21108681

素因数分解:

$3^5\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{149}}^1$

素因数の和:228

約数の個数: 48

約数和(自身を含む): 35380800

約数和(自身を除く): 14272119

約数列:

[1, 3, 9, 11, 27, 33, 53, 81, 99, 149, 159, 243, 297, 447, 477, 583, 891, 1341, 1431, 1639, 1749, 2673, 4023, 4293, 4917, 5247, 7897, 12069, 12879, 14751, 15741, 23691, 36207, 44253, 47223, 71073, 86867, 132759, 141669, 213219, 260601, 398277, 639657, 781803, 1918971, 2345409, 7036227, 21108681]

約数ペア:

[(1, 21108681), (3, 7036227), (9, 2345409), (11, 1918971), (27, 781803), (33, 639657), (53, 398277), (81, 260601), (99, 213219), (149, 141669), (159, 132759), (243, 86867), (297, 71073), (447, 47223), (477, 44253), (583, 36207), (891, 23691), (1341, 15741), (1431, 14751), (1639, 12879), (1749, 12069), (2673, 7897), (4023, 5247), (4293, 4917)]