21356680

素因数分解:

$2^3\times 5^1\times {\mathrm{199}}^1\times {\mathrm{2683}}^1$

素因数の和:2893

約数の個数: 32

約数和(自身を含む): 48312000

約数和(自身を除く): 26955320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 199, 398, 796, 995, 1592, 1990, 2683, 3980, 5366, 7960, 10732, 13415, 21464, 26830, 53660, 107320, 533917, 1067834, 2135668, 2669585, 4271336, 5339170, 10678340, 21356680]

約数ペア:

[(1, 21356680), (2, 10678340), (4, 5339170), (5, 4271336), (8, 2669585), (10, 2135668), (20, 1067834), (40, 533917), (199, 107320), (398, 53660), (796, 26830), (995, 21464), (1592, 13415), (1990, 10732), (2683, 7960), (3980, 5366)]