21278864

素因数分解:

$2^4\times {\mathrm{23}}^1\times {\mathrm{53}}^1\times {\mathrm{1091}}^1$

素因数の和:1175

約数の個数: 40

約数和(自身を含む): 43872192

約数和(自身を除く): 22593328

約数列:

[1, 2, 4, 8, 16, 23, 46, 53, 92, 106, 184, 212, 368, 424, 848, 1091, 1219, 2182, 2438, 4364, 4876, 8728, 9752, 17456, 19504, 25093, 50186, 57823, 100372, 115646, 200744, 231292, 401488, 462584, 925168, 1329929, 2659858, 5319716, 10639432, 21278864]

約数ペア:

[(1, 21278864), (2, 10639432), (4, 5319716), (8, 2659858), (16, 1329929), (23, 925168), (46, 462584), (53, 401488), (92, 231292), (106, 200744), (184, 115646), (212, 100372), (368, 57823), (424, 50186), (848, 25093), (1091, 19504), (1219, 17456), (2182, 9752), (2438, 8728), (4364, 4876)]