20771680

素因数分解:

$2^5\times 5^1\times {\mathrm{197}}^1\times {\mathrm{659}}^1$

素因数の和:871

約数の個数: 48

約数和(自身を含む): 49397040

約数和(自身を除く): 28625360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 197, 394, 659, 788, 985, 1318, 1576, 1970, 2636, 3152, 3295, 3940, 5272, 6304, 6590, 7880, 10544, 13180, 15760, 21088, 26360, 31520, 52720, 105440, 129823, 259646, 519292, 649115, 1038584, 1298230, 2077168, 2596460, 4154336, 5192920, 10385840, 20771680]

約数ペア:

[(1, 20771680), (2, 10385840), (4, 5192920), (5, 4154336), (8, 2596460), (10, 2077168), (16, 1298230), (20, 1038584), (32, 649115), (40, 519292), (80, 259646), (160, 129823), (197, 105440), (394, 52720), (659, 31520), (788, 26360), (985, 21088), (1318, 15760), (1576, 13180), (1970, 10544), (2636, 7880), (3152, 6590), (3295, 6304), (3940, 5272)]