21180915

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{3539}}^1$

素因数の和:3576

約数の個数: 48

約数和(自身を含む): 44179200

約数和(自身を除く): 22998285

約数列:

[1, 3, 5, 7, 9, 15, 19, 21, 35, 45, 57, 63, 95, 105, 133, 171, 285, 315, 399, 665, 855, 1197, 1995, 3539, 5985, 10617, 17695, 24773, 31851, 53085, 67241, 74319, 123865, 159255, 201723, 222957, 336205, 371595, 470687, 605169, 1008615, 1114785, 1412061, 2353435, 3025845, 4236183, 7060305, 21180915]

約数ペア:

[(1, 21180915), (3, 7060305), (5, 4236183), (7, 3025845), (9, 2353435), (15, 1412061), (19, 1114785), (21, 1008615), (35, 605169), (45, 470687), (57, 371595), (63, 336205), (95, 222957), (105, 201723), (133, 159255), (171, 123865), (285, 74319), (315, 67241), (399, 53085), (665, 31851), (855, 24773), (1197, 17695), (1995, 10617), (3539, 5985)]