21090400

素因数分解:

$2^5\times 5^2\times {\mathrm{41}}^1\times {\mathrm{643}}^1$

素因数の和:704

約数の個数: 72

約数和(自身を含む): 52824744

約数和(自身を除く): 31734344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 41, 50, 80, 82, 100, 160, 164, 200, 205, 328, 400, 410, 643, 656, 800, 820, 1025, 1286, 1312, 1640, 2050, 2572, 3215, 3280, 4100, 5144, 6430, 6560, 8200, 10288, 12860, 16075, 16400, 20576, 25720, 26363, 32150, 32800, 51440, 52726, 64300, 102880, 105452, 128600, 131815, 210904, 257200, 263630, 421808, 514400, 527260, 659075, 843616, 1054520, 1318150, 2109040, 2636300, 4218080, 5272600, 10545200, 21090400]

約数ペア:

[(1, 21090400), (2, 10545200), (4, 5272600), (5, 4218080), (8, 2636300), (10, 2109040), (16, 1318150), (20, 1054520), (25, 843616), (32, 659075), (40, 527260), (41, 514400), (50, 421808), (80, 263630), (82, 257200), (100, 210904), (160, 131815), (164, 128600), (200, 105452), (205, 102880), (328, 64300), (400, 52726), (410, 51440), (643, 32800), (656, 32150), (800, 26363), (820, 25720), (1025, 20576), (1286, 16400), (1312, 16075), (1640, 12860), (2050, 10288), (2572, 8200), (3215, 6560), (3280, 6430), (4100, 5144)]