21164556

素因数分解:

$2^2\times 3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{149}}^1$

素因数の和:271

約数の個数: 96

約数和(自身を含む): 60480000

約数和(自身を除く): 39315444

約数列:

[1, 2, 3, 4, 6, 7, 12, 14, 19, 21, 28, 38, 42, 57, 76, 84, 89, 114, 133, 149, 178, 228, 266, 267, 298, 356, 399, 447, 532, 534, 596, 623, 798, 894, 1043, 1068, 1246, 1596, 1691, 1788, 1869, 2086, 2492, 2831, 3129, 3382, 3738, 4172, 5073, 5662, 6258, 6764, 7476, 8493, 10146, 11324, 11837, 12516, 13261, 16986, 19817, 20292, 23674, 26522, 33972, 35511, 39634, 39783, 47348, 53044, 59451, 71022, 79268, 79566, 92827, 118902, 142044, 159132, 185654, 237804, 251959, 278481, 371308, 503918, 556962, 755877, 1007836, 1113924, 1511754, 1763713, 3023508, 3527426, 5291139, 7054852, 10582278, 21164556]

約数ペア:

[(1, 21164556), (2, 10582278), (3, 7054852), (4, 5291139), (6, 3527426), (7, 3023508), (12, 1763713), (14, 1511754), (19, 1113924), (21, 1007836), (28, 755877), (38, 556962), (42, 503918), (57, 371308), (76, 278481), (84, 251959), (89, 237804), (114, 185654), (133, 159132), (149, 142044), (178, 118902), (228, 92827), (266, 79566), (267, 79268), (298, 71022), (356, 59451), (399, 53044), (447, 47348), (532, 39783), (534, 39634), (596, 35511), (623, 33972), (798, 26522), (894, 23674), (1043, 20292), (1068, 19817), (1246, 16986), (1596, 13261), (1691, 12516), (1788, 11837), (1869, 11324), (2086, 10146), (2492, 8493), (2831, 7476), (3129, 6764), (3382, 6258), (3738, 5662), (4172, 5073)]