21665920

素因数分解:

$2^7\times 5^1\times {\mathrm{97}}^1\times {\mathrm{349}}^1$

素因数の和:465

約数の個数: 64

約数和(自身を含む): 52479000

約数和(自身を除く): 30813080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 97, 128, 160, 194, 320, 349, 388, 485, 640, 698, 776, 970, 1396, 1552, 1745, 1940, 2792, 3104, 3490, 3880, 5584, 6208, 6980, 7760, 11168, 12416, 13960, 15520, 22336, 27920, 31040, 33853, 44672, 55840, 62080, 67706, 111680, 135412, 169265, 223360, 270824, 338530, 541648, 677060, 1083296, 1354120, 2166592, 2708240, 4333184, 5416480, 10832960, 21665920]

約数ペア:

[(1, 21665920), (2, 10832960), (4, 5416480), (5, 4333184), (8, 2708240), (10, 2166592), (16, 1354120), (20, 1083296), (32, 677060), (40, 541648), (64, 338530), (80, 270824), (97, 223360), (128, 169265), (160, 135412), (194, 111680), (320, 67706), (349, 62080), (388, 55840), (485, 44672), (640, 33853), (698, 31040), (776, 27920), (970, 22336), (1396, 15520), (1552, 13960), (1745, 12416), (1940, 11168), (2792, 7760), (3104, 6980), (3490, 6208), (3880, 5584)]