20521995

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{191}}^1$

素因数の和:260

約数の個数: 64

約数和(自身を含む): 38707200

約数和(自身を除く): 18185205

約数列:

[1, 3, 5, 13, 15, 19, 29, 39, 57, 65, 87, 95, 145, 191, 195, 247, 285, 377, 435, 551, 573, 741, 955, 1131, 1235, 1653, 1885, 2483, 2755, 2865, 3629, 3705, 5539, 5655, 7163, 7449, 8265, 10887, 12415, 16617, 18145, 21489, 27695, 35815, 37245, 47177, 54435, 72007, 83085, 105241, 107445, 141531, 216021, 235885, 315723, 360035, 526205, 707655, 1080105, 1368133, 1578615, 4104399, 6840665, 20521995]

約数ペア:

[(1, 20521995), (3, 6840665), (5, 4104399), (13, 1578615), (15, 1368133), (19, 1080105), (29, 707655), (39, 526205), (57, 360035), (65, 315723), (87, 235885), (95, 216021), (145, 141531), (191, 107445), (195, 105241), (247, 83085), (285, 72007), (377, 54435), (435, 47177), (551, 37245), (573, 35815), (741, 27695), (955, 21489), (1131, 18145), (1235, 16617), (1653, 12415), (1885, 10887), (2483, 8265), (2755, 7449), (2865, 7163), (3629, 5655), (3705, 5539)]