28387220

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{19991}}^1$

素因数の和:20071

約数の個数: 24

約数和(自身を含む): 60455808

約数和(自身を除く): 32068588

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 19991, 39982, 79964, 99955, 199910, 399820, 1419361, 2838722, 5677444, 7096805, 14193610, 28387220]

約数ペア:

[(1, 28387220), (2, 14193610), (4, 7096805), (5, 5677444), (10, 2838722), (20, 1419361), (71, 399820), (142, 199910), (284, 99955), (355, 79964), (710, 39982), (1420, 19991)]