21721900

素因数分解:

$2^2\times 5^2\times {\mathrm{217219}}^1$

素因数の和:217233

約数の個数: 18

約数和(自身を含む): 47136740

約数和(自身を除く): 25414840

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 217219, 434438, 868876, 1086095, 2172190, 4344380, 5430475, 10860950, 21721900]

約数ペア:

[(1, 21721900), (2, 10860950), (4, 5430475), (5, 4344380), (10, 2172190), (20, 1086095), (25, 868876), (50, 434438), (100, 217219)]