21128392

素因数分解:

$2^3\times {\mathrm{79}}^1\times {\mathrm{101}}^1\times {\mathrm{331}}^1$

素因数の和:517

約数の個数: 32

約数和(自身を含む): 40636800

約数和(自身を除く): 19508408

約数列:

[1, 2, 4, 8, 79, 101, 158, 202, 316, 331, 404, 632, 662, 808, 1324, 2648, 7979, 15958, 26149, 31916, 33431, 52298, 63832, 66862, 104596, 133724, 209192, 267448, 2641049, 5282098, 10564196, 21128392]

約数ペア:

[(1, 21128392), (2, 10564196), (4, 5282098), (8, 2641049), (79, 267448), (101, 209192), (158, 133724), (202, 104596), (316, 66862), (331, 63832), (404, 52298), (632, 33431), (662, 31916), (808, 26149), (1324, 15958), (2648, 7979)]