21801520

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20963}}^1$

素因数の和:20989

約数の個数: 40

約数和(自身を含む): 54590256

約数和(自身を除く): 32788736

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20963, 41926, 83852, 104815, 167704, 209630, 272519, 335408, 419260, 545038, 838520, 1090076, 1362595, 1677040, 2180152, 2725190, 4360304, 5450380, 10900760, 21801520]

約数ペア:

[(1, 21801520), (2, 10900760), (4, 5450380), (5, 4360304), (8, 2725190), (10, 2180152), (13, 1677040), (16, 1362595), (20, 1090076), (26, 838520), (40, 545038), (52, 419260), (65, 335408), (80, 272519), (104, 209630), (130, 167704), (208, 104815), (260, 83852), (520, 41926), (1040, 20963)]