21378860

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{227}}^1\times {\mathrm{277}}^1$

素因数の和:530

約数の個数: 48

約数和(自身を含む): 47918304

約数和(自身を除く): 26539444

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 227, 277, 340, 454, 554, 908, 1108, 1135, 1385, 2270, 2770, 3859, 4540, 4709, 5540, 7718, 9418, 15436, 18836, 19295, 23545, 38590, 47090, 62879, 77180, 94180, 125758, 251516, 314395, 628790, 1068943, 1257580, 2137886, 4275772, 5344715, 10689430, 21378860]

約数ペア:

[(1, 21378860), (2, 10689430), (4, 5344715), (5, 4275772), (10, 2137886), (17, 1257580), (20, 1068943), (34, 628790), (68, 314395), (85, 251516), (170, 125758), (227, 94180), (277, 77180), (340, 62879), (454, 47090), (554, 38590), (908, 23545), (1108, 19295), (1135, 18836), (1385, 15436), (2270, 9418), (2770, 7718), (3859, 5540), (4540, 4709)]