21499792

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{197}}^1\times {\mathrm{359}}^1$

素因数の和:583

約数の個数: 40

約数和(自身を含む): 44193600

約数和(自身を除く): 22693808

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 152, 197, 304, 359, 394, 718, 788, 1436, 1576, 2872, 3152, 3743, 5744, 6821, 7486, 13642, 14972, 27284, 29944, 54568, 59888, 70723, 109136, 141446, 282892, 565784, 1131568, 1343737, 2687474, 5374948, 10749896, 21499792]

約数ペア:

[(1, 21499792), (2, 10749896), (4, 5374948), (8, 2687474), (16, 1343737), (19, 1131568), (38, 565784), (76, 282892), (152, 141446), (197, 109136), (304, 70723), (359, 59888), (394, 54568), (718, 29944), (788, 27284), (1436, 14972), (1576, 13642), (2872, 7486), (3152, 6821), (3743, 5744)]