20394980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{191}}^1\times {\mathrm{281}}^1$

素因数の和:500

約数の個数: 48

約数和(自身を含む): 45480960

約数和(自身を除く): 25085980

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 191, 281, 380, 382, 562, 764, 955, 1124, 1405, 1910, 2810, 3629, 3820, 5339, 5620, 7258, 10678, 14516, 18145, 21356, 26695, 36290, 53390, 53671, 72580, 106780, 107342, 214684, 268355, 536710, 1019749, 1073420, 2039498, 4078996, 5098745, 10197490, 20394980]

約数ペア:

[(1, 20394980), (2, 10197490), (4, 5098745), (5, 4078996), (10, 2039498), (19, 1073420), (20, 1019749), (38, 536710), (76, 268355), (95, 214684), (190, 107342), (191, 106780), (281, 72580), (380, 53671), (382, 53390), (562, 36290), (764, 26695), (955, 21356), (1124, 18145), (1405, 14516), (1910, 10678), (2810, 7258), (3629, 5620), (3820, 5339)]