21247121

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{179}}^1\times {\mathrm{547}}^1$

素因数の和:764

約数の個数: 16

約数和(自身を含む): 25251840

約数和(自身を除く): 4004719

約数列:

[1, 7, 31, 179, 217, 547, 1253, 3829, 5549, 16957, 38843, 97913, 118699, 685391, 3035303, 21247121]

約数ペア:

[(1, 21247121), (7, 3035303), (31, 685391), (179, 118699), (217, 97913), (547, 38843), (1253, 16957), (3829, 5549)]