19865480

素因数分解:

$2^3\times 5^1\times {\mathrm{197}}^1\times {\mathrm{2521}}^1$

素因数の和:2729

約数の個数: 32

約数和(自身を含む): 44942040

約数和(自身を除く): 25076560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 197, 394, 788, 985, 1576, 1970, 2521, 3940, 5042, 7880, 10084, 12605, 20168, 25210, 50420, 100840, 496637, 993274, 1986548, 2483185, 3973096, 4966370, 9932740, 19865480]

約数ペア:

[(1, 19865480), (2, 9932740), (4, 4966370), (5, 3973096), (8, 2483185), (10, 1986548), (20, 993274), (40, 496637), (197, 100840), (394, 50420), (788, 25210), (985, 20168), (1576, 12605), (1970, 10084), (2521, 7880), (3940, 5042)]