81771880

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{157}}^1\times {\mathrm{449}}^1$

素因数の和:646

約数の個数: 64

約数和(自身を含む): 191970000

約数和(自身を除く): 110198120

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 116, 145, 157, 232, 290, 314, 449, 580, 628, 785, 898, 1160, 1256, 1570, 1796, 2245, 3140, 3592, 4490, 4553, 6280, 8980, 9106, 13021, 17960, 18212, 22765, 26042, 36424, 45530, 52084, 65105, 70493, 91060, 104168, 130210, 140986, 182120, 260420, 281972, 352465, 520840, 563944, 704930, 1409860, 2044297, 2819720, 4088594, 8177188, 10221485, 16354376, 20442970, 40885940, 81771880]

約数ペア:

[(1, 81771880), (2, 40885940), (4, 20442970), (5, 16354376), (8, 10221485), (10, 8177188), (20, 4088594), (29, 2819720), (40, 2044297), (58, 1409860), (116, 704930), (145, 563944), (157, 520840), (232, 352465), (290, 281972), (314, 260420), (449, 182120), (580, 140986), (628, 130210), (785, 104168), (898, 91060), (1160, 70493), (1256, 65105), (1570, 52084), (1796, 45530), (2245, 36424), (3140, 26042), (3592, 22765), (4490, 18212), (4553, 17960), (6280, 13021), (8980, 9106)]