21880120

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12721}}^1$

素因数の和:12775

約数の個数: 32

約数和(自身を含む): 50379120

約数和(自身を除く): 28499000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12721, 25442, 50884, 63605, 101768, 127210, 254420, 508840, 547003, 1094006, 2188012, 2735015, 4376024, 5470030, 10940060, 21880120]

約数ペア:

[(1, 21880120), (2, 10940060), (4, 5470030), (5, 4376024), (8, 2735015), (10, 2188012), (20, 1094006), (40, 547003), (43, 508840), (86, 254420), (172, 127210), (215, 101768), (344, 63605), (430, 50884), (860, 25442), (1720, 12721)]