21497905

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{107}}^1\times {\mathrm{281}}^1$

素因数の和:417

約数の個数: 32

約数和(自身を含む): 30699648

約数和(自身を除く): 9201743

約数列:

[1, 5, 11, 13, 55, 65, 107, 143, 281, 535, 715, 1177, 1391, 1405, 3091, 3653, 5885, 6955, 15301, 15455, 18265, 30067, 40183, 76505, 150335, 200915, 330737, 390871, 1653685, 1954355, 4299581, 21497905]

約数ペア:

[(1, 21497905), (5, 4299581), (11, 1954355), (13, 1653685), (55, 390871), (65, 330737), (107, 200915), (143, 150335), (281, 76505), (535, 40183), (715, 30067), (1177, 18265), (1391, 15455), (1405, 15301), (3091, 6955), (3653, 5885)]