21278128

素因数分解:

$2^4\times {\mathrm{23}}^1\times {\mathrm{67}}^1\times {\mathrm{863}}^1$

素因数の和:961

約数の個数: 40

約数和(自身を含む): 43711488

約数和(自身を除く): 22433360

約数列:

[1, 2, 4, 8, 16, 23, 46, 67, 92, 134, 184, 268, 368, 536, 863, 1072, 1541, 1726, 3082, 3452, 6164, 6904, 12328, 13808, 19849, 24656, 39698, 57821, 79396, 115642, 158792, 231284, 317584, 462568, 925136, 1329883, 2659766, 5319532, 10639064, 21278128]

約数ペア:

[(1, 21278128), (2, 10639064), (4, 5319532), (8, 2659766), (16, 1329883), (23, 925136), (46, 462568), (67, 317584), (92, 231284), (134, 158792), (184, 115642), (268, 79396), (368, 57821), (536, 39698), (863, 24656), (1072, 19849), (1541, 13808), (1726, 12328), (3082, 6904), (3452, 6164)]