21487720

素因数分解:

$2^3\times 5^1\times {\mathrm{269}}^1\times {\mathrm{1997}}^1$

素因数の和:2277

約数の個数: 32

約数和(自身を含む): 48551400

約数和(自身を除く): 27063680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 269, 538, 1076, 1345, 1997, 2152, 2690, 3994, 5380, 7988, 9985, 10760, 15976, 19970, 39940, 79880, 537193, 1074386, 2148772, 2685965, 4297544, 5371930, 10743860, 21487720]

約数ペア:

[(1, 21487720), (2, 10743860), (4, 5371930), (5, 4297544), (8, 2685965), (10, 2148772), (20, 1074386), (40, 537193), (269, 79880), (538, 39940), (1076, 19970), (1345, 15976), (1997, 10760), (2152, 9985), (2690, 7988), (3994, 5380)]