21005868

素因数分解:

$2^2\times 3^1\times {\mathrm{13}}^1\times {\mathrm{19}}^2\times {\mathrm{373}}^1$

素因数の和:431

約数の個数: 72

約数和(自身を含む): 55857648

約数和(自身を除く): 34851780

約数列:

[1, 2, 3, 4, 6, 12, 13, 19, 26, 38, 39, 52, 57, 76, 78, 114, 156, 228, 247, 361, 373, 494, 722, 741, 746, 988, 1083, 1119, 1444, 1482, 1492, 2166, 2238, 2964, 4332, 4476, 4693, 4849, 7087, 9386, 9698, 14079, 14174, 14547, 18772, 19396, 21261, 28158, 28348, 29094, 42522, 56316, 58188, 85044, 92131, 134653, 184262, 269306, 276393, 368524, 403959, 538612, 552786, 807918, 1105572, 1615836, 1750489, 3500978, 5251467, 7001956, 10502934, 21005868]

約数ペア:

[(1, 21005868), (2, 10502934), (3, 7001956), (4, 5251467), (6, 3500978), (12, 1750489), (13, 1615836), (19, 1105572), (26, 807918), (38, 552786), (39, 538612), (52, 403959), (57, 368524), (76, 276393), (78, 269306), (114, 184262), (156, 134653), (228, 92131), (247, 85044), (361, 58188), (373, 56316), (494, 42522), (722, 29094), (741, 28348), (746, 28158), (988, 21261), (1083, 19396), (1119, 18772), (1444, 14547), (1482, 14174), (1492, 14079), (2166, 9698), (2238, 9386), (2964, 7087), (4332, 4849), (4476, 4693)]