20356720

素因数分解:

$2^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{3221}}^1$

素因数の和:3313

約数の個数: 40

約数和(自身を含む): 47943360

約数和(自身を除く): 27586640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 79, 80, 158, 316, 395, 632, 790, 1264, 1580, 3160, 3221, 6320, 6442, 12884, 16105, 25768, 32210, 51536, 64420, 128840, 254459, 257680, 508918, 1017836, 1272295, 2035672, 2544590, 4071344, 5089180, 10178360, 20356720]

約数ペア:

[(1, 20356720), (2, 10178360), (4, 5089180), (5, 4071344), (8, 2544590), (10, 2035672), (16, 1272295), (20, 1017836), (40, 508918), (79, 257680), (80, 254459), (158, 128840), (316, 64420), (395, 51536), (632, 32210), (790, 25768), (1264, 16105), (1580, 12884), (3160, 6442), (3221, 6320)]