20720830

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{8389}}^1$

素因数の和:8428

約数の個数: 32

約数和(自身を含む): 42285600

約数和(自身を除く): 21564770

約数列:

[1, 2, 5, 10, 13, 19, 26, 38, 65, 95, 130, 190, 247, 494, 1235, 2470, 8389, 16778, 41945, 83890, 109057, 159391, 218114, 318782, 545285, 796955, 1090570, 1593910, 2072083, 4144166, 10360415, 20720830]

約数ペア:

[(1, 20720830), (2, 10360415), (5, 4144166), (10, 2072083), (13, 1593910), (19, 1090570), (26, 796955), (38, 545285), (65, 318782), (95, 218114), (130, 159391), (190, 109057), (247, 83890), (494, 41945), (1235, 16778), (2470, 8389)]