20284940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{1279}}^1$

素因数の和:1362

約数の個数: 48

約数和(自身を含む): 46663680

約数和(自身を除く): 26378740

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 122, 130, 244, 260, 305, 610, 793, 1220, 1279, 1586, 2558, 3172, 3965, 5116, 6395, 7930, 12790, 15860, 16627, 25580, 33254, 66508, 78019, 83135, 156038, 166270, 312076, 332540, 390095, 780190, 1014247, 1560380, 2028494, 4056988, 5071235, 10142470, 20284940]

約数ペア:

[(1, 20284940), (2, 10142470), (4, 5071235), (5, 4056988), (10, 2028494), (13, 1560380), (20, 1014247), (26, 780190), (52, 390095), (61, 332540), (65, 312076), (122, 166270), (130, 156038), (244, 83135), (260, 78019), (305, 66508), (610, 33254), (793, 25580), (1220, 16627), (1279, 15860), (1586, 12790), (2558, 7930), (3172, 6395), (3965, 5116)]