21387340

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{1913}}^1$

素因数の和:1978

約数の個数: 48

約数和(自身を含む): 49519008

約数和(自身を除く): 28131668

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 43, 52, 65, 86, 130, 172, 215, 260, 430, 559, 860, 1118, 1913, 2236, 2795, 3826, 5590, 7652, 9565, 11180, 19130, 24869, 38260, 49738, 82259, 99476, 124345, 164518, 248690, 329036, 411295, 497380, 822590, 1069367, 1645180, 2138734, 4277468, 5346835, 10693670, 21387340]

約数ペア:

[(1, 21387340), (2, 10693670), (4, 5346835), (5, 4277468), (10, 2138734), (13, 1645180), (20, 1069367), (26, 822590), (43, 497380), (52, 411295), (65, 329036), (86, 248690), (130, 164518), (172, 124345), (215, 99476), (260, 82259), (430, 49738), (559, 38260), (860, 24869), (1118, 19130), (1913, 11180), (2236, 9565), (2795, 7652), (3826, 5590)]