20687780

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25229}}^1$

素因数の和:25279

約数の個数: 24

約数和(自身を含む): 44505720

約数和(自身を除く): 23817940

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25229, 50458, 100916, 126145, 252290, 504580, 1034389, 2068778, 4137556, 5171945, 10343890, 20687780]

約数ペア:

[(1, 20687780), (2, 10343890), (4, 5171945), (5, 4137556), (10, 2068778), (20, 1034389), (41, 504580), (82, 252290), (164, 126145), (205, 100916), (410, 50458), (820, 25229)]