20811860

素因数分解:

$2^2\times 5^1\times {\mathrm{257}}^1\times {\mathrm{4049}}^1$

素因数の和:4315

約数の個数: 24

約数和(自身を含む): 43885800

約数和(自身を除く): 23073940

約数列:

[1, 2, 4, 5, 10, 20, 257, 514, 1028, 1285, 2570, 4049, 5140, 8098, 16196, 20245, 40490, 80980, 1040593, 2081186, 4162372, 5202965, 10405930, 20811860]

約数ペア:

[(1, 20811860), (2, 10405930), (4, 5202965), (5, 4162372), (10, 2081186), (20, 1040593), (257, 80980), (514, 40490), (1028, 20245), (1285, 16196), (2570, 8098), (4049, 5140)]