19991900

素因数分解:

$2^2\times 5^2\times {\mathrm{31}}^1\times {\mathrm{6449}}^1$

素因数の和:6494

約数の個数: 36

約数和(自身を含む): 44788800

約数和(自身を除く): 24796900

約数列:

[1, 2, 4, 5, 10, 20, 25, 31, 50, 62, 100, 124, 155, 310, 620, 775, 1550, 3100, 6449, 12898, 25796, 32245, 64490, 128980, 161225, 199919, 322450, 399838, 644900, 799676, 999595, 1999190, 3998380, 4997975, 9995950, 19991900]

約数ペア:

[(1, 19991900), (2, 9995950), (4, 4997975), (5, 3998380), (10, 1999190), (20, 999595), (25, 799676), (31, 644900), (50, 399838), (62, 322450), (100, 199919), (124, 161225), (155, 128980), (310, 64490), (620, 32245), (775, 25796), (1550, 12898), (3100, 6449)]