128420540

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{90437}}^1$

素因数の和:90517

約数の個数: 24

約数和(自身を含む): 273484512

約数和(自身を除く): 145063972

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 90437, 180874, 361748, 452185, 904370, 1808740, 6421027, 12842054, 25684108, 32105135, 64210270, 128420540]

約数ペア:

[(1, 128420540), (2, 64210270), (4, 32105135), (5, 25684108), (10, 12842054), (20, 6421027), (71, 1808740), (142, 904370), (284, 452185), (355, 361748), (710, 180874), (1420, 90437)]