20878389

素因数分解:

$3^2\times 7^1\times {\mathrm{41}}^1\times {\mathrm{59}}^1\times {\mathrm{137}}^1$

素因数の和:250

約数の個数: 48

約数和(自身を含む): 36167040

約数和(自身を除く): 15288651

約数列:

[1, 3, 7, 9, 21, 41, 59, 63, 123, 137, 177, 287, 369, 411, 413, 531, 861, 959, 1233, 1239, 2419, 2583, 2877, 3717, 5617, 7257, 8083, 8631, 16851, 16933, 21771, 24249, 39319, 50553, 50799, 56581, 72747, 117957, 152397, 169743, 331403, 353871, 509229, 994209, 2319821, 2982627, 6959463, 20878389]

約数ペア:

[(1, 20878389), (3, 6959463), (7, 2982627), (9, 2319821), (21, 994209), (41, 509229), (59, 353871), (63, 331403), (123, 169743), (137, 152397), (177, 117957), (287, 72747), (369, 56581), (411, 50799), (413, 50553), (531, 39319), (861, 24249), (959, 21771), (1233, 16933), (1239, 16851), (2419, 8631), (2583, 8083), (2877, 7257), (3717, 5617)]