21100815

素因数分解:

$3^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{7687}}^1$

素因数の和:7759

約数の個数: 24

約数和(自身を含む): 37179168

約数和(自身を除く): 16078353

約数列:

[1, 3, 5, 9, 15, 45, 61, 183, 305, 549, 915, 2745, 7687, 23061, 38435, 69183, 115305, 345915, 468907, 1406721, 2344535, 4220163, 7033605, 21100815]

約数ペア:

[(1, 21100815), (3, 7033605), (5, 4220163), (9, 2344535), (15, 1406721), (45, 468907), (61, 345915), (183, 115305), (305, 69183), (549, 38435), (915, 23061), (2745, 7687)]