20128940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{77419}}^1$

素因数の和:77441

約数の個数: 24

約数和(自身を含む): 45522960

約数和(自身を除く): 25394020

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 77419, 154838, 309676, 387095, 774190, 1006447, 1548380, 2012894, 4025788, 5032235, 10064470, 20128940]

約数ペア:

[(1, 20128940), (2, 10064470), (4, 5032235), (5, 4025788), (10, 2012894), (13, 1548380), (20, 1006447), (26, 774190), (52, 387095), (65, 309676), (130, 154838), (260, 77419)]