21376640

素因数分解:

$2^7\times 5^1\times {\mathrm{127}}^1\times {\mathrm{263}}^1$

素因数の和:409

約数の個数: 64

約数和(自身を含む): 51701760

約数和(自身を除く): 30325120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 127, 128, 160, 254, 263, 320, 508, 526, 635, 640, 1016, 1052, 1270, 1315, 2032, 2104, 2540, 2630, 4064, 4208, 5080, 5260, 8128, 8416, 10160, 10520, 16256, 16832, 20320, 21040, 33401, 33664, 40640, 42080, 66802, 81280, 84160, 133604, 167005, 168320, 267208, 334010, 534416, 668020, 1068832, 1336040, 2137664, 2672080, 4275328, 5344160, 10688320, 21376640]

約数ペア:

[(1, 21376640), (2, 10688320), (4, 5344160), (5, 4275328), (8, 2672080), (10, 2137664), (16, 1336040), (20, 1068832), (32, 668020), (40, 534416), (64, 334010), (80, 267208), (127, 168320), (128, 167005), (160, 133604), (254, 84160), (263, 81280), (320, 66802), (508, 42080), (526, 40640), (635, 33664), (640, 33401), (1016, 21040), (1052, 20320), (1270, 16832), (1315, 16256), (2032, 10520), (2104, 10160), (2540, 8416), (2630, 8128), (4064, 5260), (4208, 5080)]