20321360

素因数分解:

$2^4\times 5^1\times {\mathrm{389}}^1\times {\mathrm{653}}^1$

素因数の和:1055

約数の個数: 40

約数和(自身を含む): 47441160

約数和(自身を除く): 27119800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 389, 653, 778, 1306, 1556, 1945, 2612, 3112, 3265, 3890, 5224, 6224, 6530, 7780, 10448, 13060, 15560, 26120, 31120, 52240, 254017, 508034, 1016068, 1270085, 2032136, 2540170, 4064272, 5080340, 10160680, 20321360]

約数ペア:

[(1, 20321360), (2, 10160680), (4, 5080340), (5, 4064272), (8, 2540170), (10, 2032136), (16, 1270085), (20, 1016068), (40, 508034), (80, 254017), (389, 52240), (653, 31120), (778, 26120), (1306, 15560), (1556, 13060), (1945, 10448), (2612, 7780), (3112, 6530), (3265, 6224), (3890, 5224)]