21405920

素因数分解:

$2^5\times 5^1\times {\mathrm{353}}^1\times {\mathrm{379}}^1$

素因数の和:747

約数の個数: 48

約数和(自身を含む): 50848560

約数和(自身を除く): 29442640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 353, 379, 706, 758, 1412, 1516, 1765, 1895, 2824, 3032, 3530, 3790, 5648, 6064, 7060, 7580, 11296, 12128, 14120, 15160, 28240, 30320, 56480, 60640, 133787, 267574, 535148, 668935, 1070296, 1337870, 2140592, 2675740, 4281184, 5351480, 10702960, 21405920]

約数ペア:

[(1, 21405920), (2, 10702960), (4, 5351480), (5, 4281184), (8, 2675740), (10, 2140592), (16, 1337870), (20, 1070296), (32, 668935), (40, 535148), (80, 267574), (160, 133787), (353, 60640), (379, 56480), (706, 30320), (758, 28240), (1412, 15160), (1516, 14120), (1765, 12128), (1895, 11296), (2824, 7580), (3032, 7060), (3530, 6064), (3790, 5648)]