20810000

素因数分解:

$2^4\times 5^4\times {\mathrm{2081}}^1$

素因数の和:2109

約数の個数: 50

約数和(自身を含む): 50407302

約数和(自身を除く): 29597302

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 625, 1000, 1250, 2000, 2081, 2500, 4162, 5000, 8324, 10000, 10405, 16648, 20810, 33296, 41620, 52025, 83240, 104050, 166480, 208100, 260125, 416200, 520250, 832400, 1040500, 1300625, 2081000, 2601250, 4162000, 5202500, 10405000, 20810000]

約数ペア:

[(1, 20810000), (2, 10405000), (4, 5202500), (5, 4162000), (8, 2601250), (10, 2081000), (16, 1300625), (20, 1040500), (25, 832400), (40, 520250), (50, 416200), (80, 260125), (100, 208100), (125, 166480), (200, 104050), (250, 83240), (400, 52025), (500, 41620), (625, 33296), (1000, 20810), (1250, 16648), (2000, 10405), (2081, 10000), (2500, 8324), (4162, 5000)]