20987440

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{6101}}^1$

素因数の和:6157

約数の個数: 40

約数和(自身を含む): 49938768

約数和(自身を除く): 28951328

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 6101, 12202, 24404, 30505, 48808, 61010, 97616, 122020, 244040, 262343, 488080, 524686, 1049372, 1311715, 2098744, 2623430, 4197488, 5246860, 10493720, 20987440]

約数ペア:

[(1, 20987440), (2, 10493720), (4, 5246860), (5, 4197488), (8, 2623430), (10, 2098744), (16, 1311715), (20, 1049372), (40, 524686), (43, 488080), (80, 262343), (86, 244040), (172, 122020), (215, 97616), (344, 61010), (430, 48808), (688, 30505), (860, 24404), (1720, 12202), (3440, 6101)]