21068528

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{199}}^1\times {\mathrm{509}}^1$

素因数の和:729

約数の個数: 40

約数和(自身を含む): 44268000

約数和(自身を除く): 23199472

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 199, 208, 398, 509, 796, 1018, 1592, 2036, 2587, 3184, 4072, 5174, 6617, 8144, 10348, 13234, 20696, 26468, 41392, 52936, 101291, 105872, 202582, 405164, 810328, 1316783, 1620656, 2633566, 5267132, 10534264, 21068528]

約数ペア:

[(1, 21068528), (2, 10534264), (4, 5267132), (8, 2633566), (13, 1620656), (16, 1316783), (26, 810328), (52, 405164), (104, 202582), (199, 105872), (208, 101291), (398, 52936), (509, 41392), (796, 26468), (1018, 20696), (1592, 13234), (2036, 10348), (2587, 8144), (3184, 6617), (4072, 5174)]