21183955

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{1009}}^1$

素因数の和:1063

約数の個数: 32

約数和(自身を含む): 30542400

約数和(自身を除く): 9358445

約数列:

[1, 5, 13, 17, 19, 65, 85, 95, 221, 247, 323, 1009, 1105, 1235, 1615, 4199, 5045, 13117, 17153, 19171, 20995, 65585, 85765, 95855, 222989, 249223, 325907, 1114945, 1246115, 1629535, 4236791, 21183955]

約数ペア:

[(1, 21183955), (5, 4236791), (13, 1629535), (17, 1246115), (19, 1114945), (65, 325907), (85, 249223), (95, 222989), (221, 95855), (247, 85765), (323, 65585), (1009, 20995), (1105, 19171), (1235, 17153), (1615, 13117), (4199, 5045)]