21557865

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{179}}^1$

素因数の和:262

約数の個数: 64

約数和(自身を含む): 42024960

約数和(自身を除く): 20467095

約数列:

[1, 3, 5, 7, 15, 21, 31, 35, 37, 93, 105, 111, 155, 179, 185, 217, 259, 465, 537, 555, 651, 777, 895, 1085, 1147, 1253, 1295, 2685, 3255, 3441, 3759, 3885, 5549, 5735, 6265, 6623, 8029, 16647, 17205, 18795, 19869, 24087, 27745, 33115, 38843, 40145, 46361, 83235, 99345, 116529, 120435, 139083, 194215, 205313, 231805, 582645, 615939, 695415, 1026565, 1437191, 3079695, 4311573, 7185955, 21557865]

約数ペア:

[(1, 21557865), (3, 7185955), (5, 4311573), (7, 3079695), (15, 1437191), (21, 1026565), (31, 695415), (35, 615939), (37, 582645), (93, 231805), (105, 205313), (111, 194215), (155, 139083), (179, 120435), (185, 116529), (217, 99345), (259, 83235), (465, 46361), (537, 40145), (555, 38843), (651, 33115), (777, 27745), (895, 24087), (1085, 19869), (1147, 18795), (1253, 17205), (1295, 16647), (2685, 8029), (3255, 6623), (3441, 6265), (3759, 5735), (3885, 5549)]