20805980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{1861}}^1$

素因数の和:1926

約数の個数: 48

約数和(自身を含む): 48173664

約数和(自身を除く): 27367684

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 43, 52, 65, 86, 130, 172, 215, 260, 430, 559, 860, 1118, 1861, 2236, 2795, 3722, 5590, 7444, 9305, 11180, 18610, 24193, 37220, 48386, 80023, 96772, 120965, 160046, 241930, 320092, 400115, 483860, 800230, 1040299, 1600460, 2080598, 4161196, 5201495, 10402990, 20805980]

約数ペア:

[(1, 20805980), (2, 10402990), (4, 5201495), (5, 4161196), (10, 2080598), (13, 1600460), (20, 1040299), (26, 800230), (43, 483860), (52, 400115), (65, 320092), (86, 241930), (130, 160046), (172, 120965), (215, 96772), (260, 80023), (430, 48386), (559, 37220), (860, 24193), (1118, 18610), (1861, 11180), (2236, 9305), (2795, 7444), (3722, 5590)]