21581780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{263}}^1\times {\mathrm{373}}^1$

素因数の和:656

約数の個数: 48

約数和(自身を含む): 49762944

約数和(自身を除く): 28181164

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 263, 373, 526, 746, 1052, 1315, 1492, 1865, 2630, 2893, 3730, 4103, 5260, 5786, 7460, 8206, 11572, 14465, 16412, 20515, 28930, 41030, 57860, 82060, 98099, 196198, 392396, 490495, 980990, 1079089, 1961980, 2158178, 4316356, 5395445, 10790890, 21581780]

約数ペア:

[(1, 21581780), (2, 10790890), (4, 5395445), (5, 4316356), (10, 2158178), (11, 1961980), (20, 1079089), (22, 980990), (44, 490495), (55, 392396), (110, 196198), (220, 98099), (263, 82060), (373, 57860), (526, 41030), (746, 28930), (1052, 20515), (1315, 16412), (1492, 14465), (1865, 11572), (2630, 8206), (2893, 7460), (3730, 5786), (4103, 5260)]