21312795

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{107}}^1\times {\mathrm{271}}^1$

素因数の和:400

約数の個数: 48

約数和(自身を含む): 40186368

約数和(自身を除く): 18873573

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 107, 147, 245, 271, 321, 535, 735, 749, 813, 1355, 1605, 1897, 2247, 3745, 4065, 5243, 5691, 9485, 11235, 13279, 15729, 26215, 28455, 28997, 39837, 66395, 78645, 86991, 144985, 199185, 202979, 434955, 608937, 1014895, 1420853, 3044685, 4262559, 7104265, 21312795]

約数ペア:

[(1, 21312795), (3, 7104265), (5, 4262559), (7, 3044685), (15, 1420853), (21, 1014895), (35, 608937), (49, 434955), (105, 202979), (107, 199185), (147, 144985), (245, 86991), (271, 78645), (321, 66395), (535, 39837), (735, 28997), (749, 28455), (813, 26215), (1355, 15729), (1605, 13279), (1897, 11235), (2247, 9485), (3745, 5691), (4065, 5243)]