20391940

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{103}}^1\times {\mathrm{521}}^1$

素因数の和:652

約数の個数: 48

約数和(自身を含む): 45601920

約数和(自身を除く): 25209980

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 103, 190, 206, 380, 412, 515, 521, 1030, 1042, 1957, 2060, 2084, 2605, 3914, 5210, 7828, 9785, 9899, 10420, 19570, 19798, 39140, 39596, 49495, 53663, 98990, 107326, 197980, 214652, 268315, 536630, 1019597, 1073260, 2039194, 4078388, 5097985, 10195970, 20391940]

約数ペア:

[(1, 20391940), (2, 10195970), (4, 5097985), (5, 4078388), (10, 2039194), (19, 1073260), (20, 1019597), (38, 536630), (76, 268315), (95, 214652), (103, 197980), (190, 107326), (206, 98990), (380, 53663), (412, 49495), (515, 39596), (521, 39140), (1030, 19798), (1042, 19570), (1957, 10420), (2060, 9899), (2084, 9785), (2605, 7828), (3914, 5210)]