20992784

素因数分解:

$2^4\times {\mathrm{61}}^1\times {\mathrm{137}}^1\times {\mathrm{157}}^1$

素因数の和:363

約数の個数: 40

約数和(自身を含む): 41907288

約数和(自身を除く): 20914504

約数列:

[1, 2, 4, 8, 16, 61, 122, 137, 157, 244, 274, 314, 488, 548, 628, 976, 1096, 1256, 2192, 2512, 8357, 9577, 16714, 19154, 21509, 33428, 38308, 43018, 66856, 76616, 86036, 133712, 153232, 172072, 344144, 1312049, 2624098, 5248196, 10496392, 20992784]

約数ペア:

[(1, 20992784), (2, 10496392), (4, 5248196), (8, 2624098), (16, 1312049), (61, 344144), (122, 172072), (137, 153232), (157, 133712), (244, 86036), (274, 76616), (314, 66856), (488, 43018), (548, 38308), (628, 33428), (976, 21509), (1096, 19154), (1256, 16714), (2192, 9577), (2512, 8357)]