21781809

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{587}}^1$

素因数の和:650

約数の個数: 48

約数和(自身を含む): 39137280

約数和(自身を除く): 17355471

約数列:

[1, 3, 7, 9, 19, 21, 31, 57, 63, 93, 133, 171, 217, 279, 399, 587, 589, 651, 1197, 1761, 1767, 1953, 4109, 4123, 5283, 5301, 11153, 12327, 12369, 18197, 33459, 36981, 37107, 54591, 78071, 100377, 127379, 163773, 234213, 345743, 382137, 702639, 1037229, 1146411, 2420201, 3111687, 7260603, 21781809]

約数ペア:

[(1, 21781809), (3, 7260603), (7, 3111687), (9, 2420201), (19, 1146411), (21, 1037229), (31, 702639), (57, 382137), (63, 345743), (93, 234213), (133, 163773), (171, 127379), (217, 100377), (279, 78071), (399, 54591), (587, 37107), (589, 36981), (651, 33459), (1197, 18197), (1761, 12369), (1767, 12327), (1953, 11153), (4109, 5301), (4123, 5283)]