21370105

素因数分解:

$5^1\times {\mathrm{17}}^2\times {\mathrm{23}}^1\times {\mathrm{643}}^1$

素因数の和:705

約数の個数: 24

約数和(自身を含む): 28469952

約数和(自身を除く): 7099847

約数列:

[1, 5, 17, 23, 85, 115, 289, 391, 643, 1445, 1955, 3215, 6647, 10931, 14789, 33235, 54655, 73945, 185827, 251413, 929135, 1257065, 4274021, 21370105]

約数ペア:

[(1, 21370105), (5, 4274021), (17, 1257065), (23, 929135), (85, 251413), (115, 185827), (289, 73945), (391, 54655), (643, 33235), (1445, 14789), (1955, 10931), (3215, 6647)]