21484880

素因数分解:

$2^4\times 5^1\times {\mathrm{271}}^1\times {\mathrm{991}}^1$

素因数の和:1275

約数の個数: 40

約数和(自身を含む): 50187264

約数和(自身を除く): 28702384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 271, 542, 991, 1084, 1355, 1982, 2168, 2710, 3964, 4336, 4955, 5420, 7928, 9910, 10840, 15856, 19820, 21680, 39640, 79280, 268561, 537122, 1074244, 1342805, 2148488, 2685610, 4296976, 5371220, 10742440, 21484880]

約数ペア:

[(1, 21484880), (2, 10742440), (4, 5371220), (5, 4296976), (8, 2685610), (10, 2148488), (16, 1342805), (20, 1074244), (40, 537122), (80, 268561), (271, 79280), (542, 39640), (991, 21680), (1084, 19820), (1355, 15856), (1982, 10840), (2168, 9910), (2710, 7928), (3964, 5420), (4336, 4955)]