18886820

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{113}}^1\times {\mathrm{137}}^1$

素因数の和:320

約数の個数: 48

約数和(自身を含む): 40966128

約数和(自身を除く): 22079308

約数列:

[1, 2, 4, 5, 10, 20, 61, 113, 122, 137, 226, 244, 274, 305, 452, 548, 565, 610, 685, 1130, 1220, 1370, 2260, 2740, 6893, 8357, 13786, 15481, 16714, 27572, 30962, 33428, 34465, 41785, 61924, 68930, 77405, 83570, 137860, 154810, 167140, 309620, 944341, 1888682, 3777364, 4721705, 9443410, 18886820]

約数ペア:

[(1, 18886820), (2, 9443410), (4, 4721705), (5, 3777364), (10, 1888682), (20, 944341), (61, 309620), (113, 167140), (122, 154810), (137, 137860), (226, 83570), (244, 77405), (274, 68930), (305, 61924), (452, 41785), (548, 34465), (565, 33428), (610, 30962), (685, 27572), (1130, 16714), (1220, 15481), (1370, 13786), (2260, 8357), (2740, 6893)]