20913520

素因数分解:

$2^4\times 5^1\times {\mathrm{197}}^1\times {\mathrm{1327}}^1$

素因数の和:1537

約数の個数: 40

約数和(自身を含む): 48907584

約数和(自身を除く): 27994064

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 197, 394, 788, 985, 1327, 1576, 1970, 2654, 3152, 3940, 5308, 6635, 7880, 10616, 13270, 15760, 21232, 26540, 53080, 106160, 261419, 522838, 1045676, 1307095, 2091352, 2614190, 4182704, 5228380, 10456760, 20913520]

約数ペア:

[(1, 20913520), (2, 10456760), (4, 5228380), (5, 4182704), (8, 2614190), (10, 2091352), (16, 1307095), (20, 1045676), (40, 522838), (80, 261419), (197, 106160), (394, 53080), (788, 26540), (985, 21232), (1327, 15760), (1576, 13270), (1970, 10616), (2654, 7880), (3152, 6635), (3940, 5308)]