21399040

素因数分解:

$2^9\times 5^1\times {\mathrm{13}}^1\times {\mathrm{643}}^1$

素因数の和:679

約数の個数: 80

約数和(自身を含む): 55340208

約数和(自身を除く): 33941168

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 256, 260, 320, 416, 512, 520, 640, 643, 832, 1040, 1280, 1286, 1664, 2080, 2560, 2572, 3215, 3328, 4160, 5144, 6430, 6656, 8320, 8359, 10288, 12860, 16640, 16718, 20576, 25720, 33280, 33436, 41152, 41795, 51440, 66872, 82304, 83590, 102880, 133744, 164608, 167180, 205760, 267488, 329216, 334360, 411520, 534976, 668720, 823040, 1069952, 1337440, 1646080, 2139904, 2674880, 4279808, 5349760, 10699520, 21399040]

約数ペア:

[(1, 21399040), (2, 10699520), (4, 5349760), (5, 4279808), (8, 2674880), (10, 2139904), (13, 1646080), (16, 1337440), (20, 1069952), (26, 823040), (32, 668720), (40, 534976), (52, 411520), (64, 334360), (65, 329216), (80, 267488), (104, 205760), (128, 167180), (130, 164608), (160, 133744), (208, 102880), (256, 83590), (260, 82304), (320, 66872), (416, 51440), (512, 41795), (520, 41152), (640, 33436), (643, 33280), (832, 25720), (1040, 20576), (1280, 16718), (1286, 16640), (1664, 12860), (2080, 10288), (2560, 8359), (2572, 8320), (3215, 6656), (3328, 6430), (4160, 5144)]