21409790

素因数分解:

$2^1\times 5^1\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{661}}^1$

素因数の和:788

約数の個数: 32

約数和(自身を含む): 40037760

約数和(自身を除く): 18627970

約数列:

[1, 2, 5, 10, 41, 79, 82, 158, 205, 395, 410, 661, 790, 1322, 3239, 3305, 6478, 6610, 16195, 27101, 32390, 52219, 54202, 104438, 135505, 261095, 271010, 522190, 2140979, 4281958, 10704895, 21409790]

約数ペア:

[(1, 21409790), (2, 10704895), (5, 4281958), (10, 2140979), (41, 522190), (79, 271010), (82, 261095), (158, 135505), (205, 104438), (395, 54202), (410, 52219), (661, 32390), (790, 27101), (1322, 16195), (3239, 6610), (3305, 6478)]