21387860

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{82261}}^1$

素因数の和:82283

約数の個数: 24

約数和(自身を含む): 48370056

約数和(自身を除く): 26982196

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 82261, 164522, 329044, 411305, 822610, 1069393, 1645220, 2138786, 4277572, 5346965, 10693930, 21387860]

約数ペア:

[(1, 21387860), (2, 10693930), (4, 5346965), (5, 4277572), (10, 2138786), (13, 1645220), (20, 1069393), (26, 822610), (52, 411305), (65, 329044), (130, 164522), (260, 82261)]