19987715

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{617}}^1$

素因数の和:683

約数の個数: 32

約数和(自身を含む): 28477440

約数和(自身を除く): 8489725

約数列:

[1, 5, 11, 19, 31, 55, 95, 155, 209, 341, 589, 617, 1045, 1705, 2945, 3085, 6479, 6787, 11723, 19127, 32395, 33935, 58615, 95635, 128953, 210397, 363413, 644765, 1051985, 1817065, 3997543, 19987715]

約数ペア:

[(1, 19987715), (5, 3997543), (11, 1817065), (19, 1051985), (31, 644765), (55, 363413), (95, 210397), (155, 128953), (209, 95635), (341, 58615), (589, 33935), (617, 32395), (1045, 19127), (1705, 11723), (2945, 6787), (3085, 6479)]