21091525

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{127}}^1$

素因数の和:230

約数の個数: 48

約数和(自身を含む): 32886784

約数和(自身を除く): 11795259

約数列:

[1, 5, 7, 13, 25, 35, 65, 73, 91, 127, 175, 325, 365, 455, 511, 635, 889, 949, 1651, 1825, 2275, 2555, 3175, 4445, 4745, 6643, 8255, 9271, 11557, 12775, 22225, 23725, 33215, 41275, 46355, 57785, 64897, 120523, 166075, 231775, 288925, 324485, 602615, 843661, 1622425, 3013075, 4218305, 21091525]

約数ペア:

[(1, 21091525), (5, 4218305), (7, 3013075), (13, 1622425), (25, 843661), (35, 602615), (65, 324485), (73, 288925), (91, 231775), (127, 166075), (175, 120523), (325, 64897), (365, 57785), (455, 46355), (511, 41275), (635, 33215), (889, 23725), (949, 22225), (1651, 12775), (1825, 11557), (2275, 9271), (2555, 8255), (3175, 6643), (4445, 4745)]