21172555

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1$

素因数の和:211

約数の個数: 32

約数和(自身を含む): 28131840

約数和(自身を除く): 6959285

約数列:

[1, 5, 19, 43, 71, 73, 95, 215, 355, 365, 817, 1349, 1387, 3053, 3139, 4085, 5183, 6745, 6935, 15265, 15695, 25915, 58007, 59641, 98477, 222869, 290035, 298205, 492385, 1114345, 4234511, 21172555]

約数ペア:

[(1, 21172555), (5, 4234511), (19, 1114345), (43, 492385), (71, 298205), (73, 290035), (95, 222869), (215, 98477), (355, 59641), (365, 58007), (817, 25915), (1349, 15695), (1387, 15265), (3053, 6935), (3139, 6745), (4085, 5183)]