20981584

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{149}}^1\times {\mathrm{677}}^1$

素因数の和:847

約数の個数: 40

約数和(自身を含む): 44137800

約数和(自身を除く): 23156216

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 149, 208, 298, 596, 677, 1192, 1354, 1937, 2384, 2708, 3874, 5416, 7748, 8801, 10832, 15496, 17602, 30992, 35204, 70408, 100873, 140816, 201746, 403492, 806984, 1311349, 1613968, 2622698, 5245396, 10490792, 20981584]

約数ペア:

[(1, 20981584), (2, 10490792), (4, 5245396), (8, 2622698), (13, 1613968), (16, 1311349), (26, 806984), (52, 403492), (104, 201746), (149, 140816), (208, 100873), (298, 70408), (596, 35204), (677, 30992), (1192, 17602), (1354, 15496), (1937, 10832), (2384, 8801), (2708, 7748), (3874, 5416)]