257660

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{991}}^1$

素因数の和:1013

約数の個数: 24

約数和(自身を含む): 583296

約数和(自身を除く): 325636

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 991, 1982, 3964, 4955, 9910, 12883, 19820, 25766, 51532, 64415, 128830, 257660]

約数ペア:

[(1, 257660), (2, 128830), (4, 64415), (5, 51532), (10, 25766), (13, 19820), (20, 12883), (26, 9910), (52, 4955), (65, 3964), (130, 1982), (260, 991)]