20001605

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{787}}^1$

素因数の和:845

約数の個数: 32

約数和(自身を含む): 28594944

約数和(自身を除く): 8593339

約数列:

[1, 5, 13, 17, 23, 65, 85, 115, 221, 299, 391, 787, 1105, 1495, 1955, 3935, 5083, 10231, 13379, 18101, 25415, 51155, 66895, 90505, 173927, 235313, 307717, 869635, 1176565, 1538585, 4000321, 20001605]

約数ペア:

[(1, 20001605), (5, 4000321), (13, 1538585), (17, 1176565), (23, 869635), (65, 307717), (85, 235313), (115, 173927), (221, 90505), (299, 66895), (391, 51155), (787, 25415), (1105, 18101), (1495, 13379), (1955, 10231), (3935, 5083)]