21178885

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{523}}^1$

素因数の和:637

約数の個数: 32

約数和(自身を含む): 31691520

約数和(自身を除く): 10512635

約数列:

[1, 5, 7, 13, 35, 65, 89, 91, 445, 455, 523, 623, 1157, 2615, 3115, 3661, 5785, 6799, 8099, 18305, 33995, 40495, 46547, 47593, 232735, 237965, 325829, 605111, 1629145, 3025555, 4235777, 21178885]

約数ペア:

[(1, 21178885), (5, 4235777), (7, 3025555), (13, 1629145), (35, 605111), (65, 325829), (89, 237965), (91, 232735), (445, 47593), (455, 46547), (523, 40495), (623, 33995), (1157, 18305), (2615, 8099), (3115, 6799), (3661, 5785)]