21484040

素因数分解:

$2^3\times 5^1\times {\mathrm{199}}^1\times {\mathrm{2699}}^1$

素因数の和:2909

約数の個数: 32

約数和(自身を含む): 48600000

約数和(自身を除く): 27115960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 199, 398, 796, 995, 1592, 1990, 2699, 3980, 5398, 7960, 10796, 13495, 21592, 26990, 53980, 107960, 537101, 1074202, 2148404, 2685505, 4296808, 5371010, 10742020, 21484040]

約数ペア:

[(1, 21484040), (2, 10742020), (4, 5371010), (5, 4296808), (8, 2685505), (10, 2148404), (20, 1074202), (40, 537101), (199, 107960), (398, 53980), (796, 26990), (995, 21592), (1592, 13495), (1990, 10796), (2699, 7960), (3980, 5398)]