21354880

素因数分解:

$2^7\times 5^1\times {\mathrm{61}}^1\times {\mathrm{547}}^1$

素因数の和:627

約数の個数: 64

約数和(自身を含む): 51983280

約数和(自身を除く): 30628400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 64, 80, 122, 128, 160, 244, 305, 320, 488, 547, 610, 640, 976, 1094, 1220, 1952, 2188, 2440, 2735, 3904, 4376, 4880, 5470, 7808, 8752, 9760, 10940, 17504, 19520, 21880, 33367, 35008, 39040, 43760, 66734, 70016, 87520, 133468, 166835, 175040, 266936, 333670, 350080, 533872, 667340, 1067744, 1334680, 2135488, 2669360, 4270976, 5338720, 10677440, 21354880]

約数ペア:

[(1, 21354880), (2, 10677440), (4, 5338720), (5, 4270976), (8, 2669360), (10, 2135488), (16, 1334680), (20, 1067744), (32, 667340), (40, 533872), (61, 350080), (64, 333670), (80, 266936), (122, 175040), (128, 166835), (160, 133468), (244, 87520), (305, 70016), (320, 66734), (488, 43760), (547, 39040), (610, 35008), (640, 33367), (976, 21880), (1094, 19520), (1220, 17504), (1952, 10940), (2188, 9760), (2440, 8752), (2735, 7808), (3904, 5470), (4376, 4880)]