21645845

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{1031}}^1$

素因数の和:1085

約数の個数: 32

約数和(自身を含む): 31207680

約数和(自身を除く): 9561835

約数列:

[1, 5, 13, 17, 19, 65, 85, 95, 221, 247, 323, 1031, 1105, 1235, 1615, 4199, 5155, 13403, 17527, 19589, 20995, 67015, 87635, 97945, 227851, 254657, 333013, 1139255, 1273285, 1665065, 4329169, 21645845]

約数ペア:

[(1, 21645845), (5, 4329169), (13, 1665065), (17, 1273285), (19, 1139255), (65, 333013), (85, 254657), (95, 227851), (221, 97945), (247, 87635), (323, 67015), (1031, 20995), (1105, 19589), (1235, 17527), (1615, 13403), (4199, 5155)]