21218896

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{223}}^1\times {\mathrm{313}}^1$

素因数の和:563

約数の個数: 40

約数和(自身を含む): 43608320

約数和(自身を除く): 22389424

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 152, 223, 304, 313, 446, 626, 892, 1252, 1784, 2504, 3568, 4237, 5008, 5947, 8474, 11894, 16948, 23788, 33896, 47576, 67792, 69799, 95152, 139598, 279196, 558392, 1116784, 1326181, 2652362, 5304724, 10609448, 21218896]

約数ペア:

[(1, 21218896), (2, 10609448), (4, 5304724), (8, 2652362), (16, 1326181), (19, 1116784), (38, 558392), (76, 279196), (152, 139598), (223, 95152), (304, 69799), (313, 67792), (446, 47576), (626, 33896), (892, 23788), (1252, 16948), (1784, 11894), (2504, 8474), (3568, 5947), (4237, 5008)]