21276680

素因数分解:

$2^3\times 5^1\times {\mathrm{331}}^1\times {\mathrm{1607}}^1$

素因数の和:1949

約数の個数: 32

約数和(自身を含む): 48047040

約数和(自身を除く): 26770360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 331, 662, 1324, 1607, 1655, 2648, 3214, 3310, 6428, 6620, 8035, 12856, 13240, 16070, 32140, 64280, 531917, 1063834, 2127668, 2659585, 4255336, 5319170, 10638340, 21276680]

約数ペア:

[(1, 21276680), (2, 10638340), (4, 5319170), (5, 4255336), (8, 2659585), (10, 2127668), (20, 1063834), (40, 531917), (331, 64280), (662, 32140), (1324, 16070), (1607, 13240), (1655, 12856), (2648, 8035), (3214, 6620), (3310, 6428)]