20478965

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{431}}^1$

素因数の和:509

約数の個数: 32

約数和(自身を含む): 28740096

約数和(自身を除く): 8261131

約数列:

[1, 5, 13, 17, 43, 65, 85, 215, 221, 431, 559, 731, 1105, 2155, 2795, 3655, 5603, 7327, 9503, 18533, 28015, 36635, 47515, 92665, 95251, 240929, 315061, 476255, 1204645, 1575305, 4095793, 20478965]

約数ペア:

[(1, 20478965), (5, 4095793), (13, 1575305), (17, 1204645), (43, 476255), (65, 315061), (85, 240929), (215, 95251), (221, 92665), (431, 47515), (559, 36635), (731, 28015), (1105, 18533), (2155, 9503), (2795, 7327), (3655, 5603)]