21261555

素因数分解:

$3^3\times 5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{151}}^1$

素因数の和:321

約数の個数: 64

約数和(自身を含む): 43776000

約数和(自身を除く): 22514445

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 105, 135, 149, 151, 189, 315, 447, 453, 745, 755, 945, 1043, 1057, 1341, 1359, 2235, 2265, 3129, 3171, 4023, 4077, 5215, 5285, 6705, 6795, 9387, 9513, 15645, 15855, 20115, 20385, 22499, 28161, 28539, 46935, 47565, 67497, 112495, 140805, 142695, 157493, 202491, 337485, 472479, 607473, 787465, 1012455, 1417437, 2362395, 3037365, 4252311, 7087185, 21261555]

約数ペア:

[(1, 21261555), (3, 7087185), (5, 4252311), (7, 3037365), (9, 2362395), (15, 1417437), (21, 1012455), (27, 787465), (35, 607473), (45, 472479), (63, 337485), (105, 202491), (135, 157493), (149, 142695), (151, 140805), (189, 112495), (315, 67497), (447, 47565), (453, 46935), (745, 28539), (755, 28161), (945, 22499), (1043, 20385), (1057, 20115), (1341, 15855), (1359, 15645), (2235, 9513), (2265, 9387), (3129, 6795), (3171, 6705), (4023, 5285), (4077, 5215)]