19801900

素因数分解:

$2^2\times 5^2\times {\mathrm{71}}^1\times {\mathrm{2789}}^1$

素因数の和:2874

約数の個数: 36

約数和(自身を含む): 43590960

約数和(自身を除く): 23789060

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 71, 100, 142, 284, 355, 710, 1420, 1775, 2789, 3550, 5578, 7100, 11156, 13945, 27890, 55780, 69725, 139450, 198019, 278900, 396038, 792076, 990095, 1980190, 3960380, 4950475, 9900950, 19801900]

約数ペア:

[(1, 19801900), (2, 9900950), (4, 4950475), (5, 3960380), (10, 1980190), (20, 990095), (25, 792076), (50, 396038), (71, 278900), (100, 198019), (142, 139450), (284, 69725), (355, 55780), (710, 27890), (1420, 13945), (1775, 11156), (2789, 7100), (3550, 5578)]