21188205

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{27697}}^1$

素因数の和:27725

約数の個数: 24

約数和(自身を含む): 38887992

約数和(自身を除く): 17699787

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 27697, 83091, 138485, 249273, 415455, 470849, 1246365, 1412547, 2354245, 4237641, 7062735, 21188205]

約数ペア:

[(1, 21188205), (3, 7062735), (5, 4237641), (9, 2354245), (15, 1412547), (17, 1246365), (45, 470849), (51, 415455), (85, 249273), (153, 138485), (255, 83091), (765, 27697)]