21057880

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{487}}^1$

素因数の和:568

約数の個数: 64

約数和(自身を含む): 50595840

約数和(自身を除く): 29537960

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 47, 92, 94, 115, 184, 188, 230, 235, 376, 460, 470, 487, 920, 940, 974, 1081, 1880, 1948, 2162, 2435, 3896, 4324, 4870, 5405, 8648, 9740, 10810, 11201, 19480, 21620, 22402, 22889, 43240, 44804, 45778, 56005, 89608, 91556, 112010, 114445, 183112, 224020, 228890, 448040, 457780, 526447, 915560, 1052894, 2105788, 2632235, 4211576, 5264470, 10528940, 21057880]

約数ペア:

[(1, 21057880), (2, 10528940), (4, 5264470), (5, 4211576), (8, 2632235), (10, 2105788), (20, 1052894), (23, 915560), (40, 526447), (46, 457780), (47, 448040), (92, 228890), (94, 224020), (115, 183112), (184, 114445), (188, 112010), (230, 91556), (235, 89608), (376, 56005), (460, 45778), (470, 44804), (487, 43240), (920, 22889), (940, 22402), (974, 21620), (1081, 19480), (1880, 11201), (1948, 10810), (2162, 9740), (2435, 8648), (3896, 5405), (4324, 4870)]