21781815

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^3\times {\mathrm{1091}}^1$

素因数の和:1132

約数の個数: 32

約数和(自身を含む): 38368512

約数和(自身を除く): 16586697

約数列:

[1, 3, 5, 11, 15, 33, 55, 121, 165, 363, 605, 1091, 1331, 1815, 3273, 3993, 5455, 6655, 12001, 16365, 19965, 36003, 60005, 132011, 180015, 396033, 660055, 1452121, 1980165, 4356363, 7260605, 21781815]

約数ペア:

[(1, 21781815), (3, 7260605), (5, 4356363), (11, 1980165), (15, 1452121), (33, 660055), (55, 396033), (121, 180015), (165, 132011), (363, 60005), (605, 36003), (1091, 19965), (1331, 16365), (1815, 12001), (3273, 6655), (3993, 5455)]