21543040

素因数分解:

$2^7\times 5^1\times {\mathrm{41}}^1\times {\mathrm{821}}^1$

素因数の和:881

約数の個数: 64

約数和(自身を含む): 52821720

約数和(自身を除く): 31278680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 41, 64, 80, 82, 128, 160, 164, 205, 320, 328, 410, 640, 656, 820, 821, 1312, 1640, 1642, 2624, 3280, 3284, 4105, 5248, 6560, 6568, 8210, 13120, 13136, 16420, 26240, 26272, 32840, 33661, 52544, 65680, 67322, 105088, 131360, 134644, 168305, 262720, 269288, 336610, 525440, 538576, 673220, 1077152, 1346440, 2154304, 2692880, 4308608, 5385760, 10771520, 21543040]

約数ペア:

[(1, 21543040), (2, 10771520), (4, 5385760), (5, 4308608), (8, 2692880), (10, 2154304), (16, 1346440), (20, 1077152), (32, 673220), (40, 538576), (41, 525440), (64, 336610), (80, 269288), (82, 262720), (128, 168305), (160, 134644), (164, 131360), (205, 105088), (320, 67322), (328, 65680), (410, 52544), (640, 33661), (656, 32840), (820, 26272), (821, 26240), (1312, 16420), (1640, 13136), (1642, 13120), (2624, 8210), (3280, 6568), (3284, 6560), (4105, 5248)]