21025305

素因数分解:

$3^3\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{1171}}^1$

素因数の和:1211

約数の個数: 64

約数和(自身を含む): 45004800

約数和(自身を除く): 23979495

約数列:

[1, 3, 5, 7, 9, 15, 19, 21, 27, 35, 45, 57, 63, 95, 105, 133, 135, 171, 189, 285, 315, 399, 513, 665, 855, 945, 1171, 1197, 1995, 2565, 3513, 3591, 5855, 5985, 8197, 10539, 17565, 17955, 22249, 24591, 31617, 40985, 52695, 66747, 73773, 111245, 122955, 155743, 158085, 200241, 221319, 333735, 368865, 467229, 600723, 778715, 1001205, 1106595, 1401687, 2336145, 3003615, 4205061, 7008435, 21025305]

約数ペア:

[(1, 21025305), (3, 7008435), (5, 4205061), (7, 3003615), (9, 2336145), (15, 1401687), (19, 1106595), (21, 1001205), (27, 778715), (35, 600723), (45, 467229), (57, 368865), (63, 333735), (95, 221319), (105, 200241), (133, 158085), (135, 155743), (171, 122955), (189, 111245), (285, 73773), (315, 66747), (399, 52695), (513, 40985), (665, 31617), (855, 24591), (945, 22249), (1171, 17955), (1197, 17565), (1995, 10539), (2565, 8197), (3513, 5985), (3591, 5855)]