21264685

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^2\times {\mathrm{389}}^1$

素因数の和:465

約数の個数: 24

約数和(自身を含む): 28533960

約数和(自身を除く): 7269275

約数列:

[1, 5, 13, 29, 65, 145, 377, 389, 841, 1885, 1945, 4205, 5057, 10933, 11281, 25285, 54665, 56405, 146653, 327149, 733265, 1635745, 4252937, 21264685]

約数ペア:

[(1, 21264685), (5, 4252937), (13, 1635745), (29, 733265), (65, 327149), (145, 146653), (377, 56405), (389, 54665), (841, 25285), (1885, 11281), (1945, 10933), (4205, 5057)]