261040

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{251}}^1$

素因数の和:277

約数の個数: 40

約数和(自身を含む): 656208

約数和(自身を除く): 395168

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 251, 260, 502, 520, 1004, 1040, 1255, 2008, 2510, 3263, 4016, 5020, 6526, 10040, 13052, 16315, 20080, 26104, 32630, 52208, 65260, 130520, 261040]

約数ペア:

[(1, 261040), (2, 130520), (4, 65260), (5, 52208), (8, 32630), (10, 26104), (13, 20080), (16, 16315), (20, 13052), (26, 10040), (40, 6526), (52, 5020), (65, 4016), (80, 3263), (104, 2510), (130, 2008), (208, 1255), (251, 1040), (260, 1004), (502, 520)]