20856784

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{197}}^1\times {\mathrm{509}}^1$

素因数の和:727

約数の個数: 40

約数和(自身を含む): 43825320

約数和(自身を除く): 22968536

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 197, 208, 394, 509, 788, 1018, 1576, 2036, 2561, 3152, 4072, 5122, 6617, 8144, 10244, 13234, 20488, 26468, 40976, 52936, 100273, 105872, 200546, 401092, 802184, 1303549, 1604368, 2607098, 5214196, 10428392, 20856784]

約数ペア:

[(1, 20856784), (2, 10428392), (4, 5214196), (8, 2607098), (13, 1604368), (16, 1303549), (26, 802184), (52, 401092), (104, 200546), (197, 105872), (208, 100273), (394, 52936), (509, 40976), (788, 26468), (1018, 20488), (1576, 13234), (2036, 10244), (2561, 8144), (3152, 6617), (4072, 5122)]