21240518

素因数分解:

$2^1\times {\mathrm{13}}^1\times {\mathrm{19}}^2\times {\mathrm{31}}^1\times {\mathrm{73}}^1$

素因数の和:157

約数の個数: 48

約数和(自身を含む): 37892736

約数和(自身を除く): 16652218

約数列:

[1, 2, 13, 19, 26, 31, 38, 62, 73, 146, 247, 361, 403, 494, 589, 722, 806, 949, 1178, 1387, 1898, 2263, 2774, 4526, 4693, 7657, 9386, 11191, 15314, 18031, 22382, 26353, 29419, 36062, 42997, 52706, 58838, 85994, 145483, 290966, 342589, 558961, 685178, 816943, 1117922, 1633886, 10620259, 21240518]

約数ペア:

[(1, 21240518), (2, 10620259), (13, 1633886), (19, 1117922), (26, 816943), (31, 685178), (38, 558961), (62, 342589), (73, 290966), (146, 145483), (247, 85994), (361, 58838), (403, 52706), (494, 42997), (589, 36062), (722, 29419), (806, 26353), (949, 22382), (1178, 18031), (1387, 15314), (1898, 11191), (2263, 9386), (2774, 7657), (4526, 4693)]