21321365

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{331}}^1\times {\mathrm{991}}^1$

素因数の和:1340

約数の個数: 16

約数和(自身を含む): 27664896

約数和(自身を除く): 6343531

約数列:

[1, 5, 13, 65, 331, 991, 1655, 4303, 4955, 12883, 21515, 64415, 328021, 1640105, 4264273, 21321365]

約数ペア:

[(1, 21321365), (5, 4264273), (13, 1640105), (65, 328021), (331, 64415), (991, 21515), (1655, 12883), (4303, 4955)]