19998940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{76919}}^1$

素因数の和:76941

約数の個数: 24

約数和(自身を含む): 45228960

約数和(自身を除く): 25230020

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 76919, 153838, 307676, 384595, 769190, 999947, 1538380, 1999894, 3999788, 4999735, 9999470, 19998940]

約数ペア:

[(1, 19998940), (2, 9999470), (4, 4999735), (5, 3999788), (10, 1999894), (13, 1538380), (20, 999947), (26, 769190), (52, 384595), (65, 307676), (130, 153838), (260, 76919)]