20781117

素因数分解:

$3^5\times 7^1\times {\mathrm{19}}^1\times {\mathrm{643}}^1$

素因数の和:684

約数の個数: 48

約数和(自身を含む): 37506560

約数和(自身を除く): 16725443

約数列:

[1, 3, 7, 9, 19, 21, 27, 57, 63, 81, 133, 171, 189, 243, 399, 513, 567, 643, 1197, 1539, 1701, 1929, 3591, 4501, 4617, 5787, 10773, 12217, 13503, 17361, 32319, 36651, 40509, 52083, 85519, 109953, 121527, 156249, 256557, 329859, 364581, 769671, 989577, 1093743, 2309013, 2968731, 6927039, 20781117]

約数ペア:

[(1, 20781117), (3, 6927039), (7, 2968731), (9, 2309013), (19, 1093743), (21, 989577), (27, 769671), (57, 364581), (63, 329859), (81, 256557), (133, 156249), (171, 121527), (189, 109953), (243, 85519), (399, 52083), (513, 40509), (567, 36651), (643, 32319), (1197, 17361), (1539, 13503), (1701, 12217), (1929, 10773), (3591, 5787), (4501, 4617)]