21391890

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{54851}}^1$

素因数の和:54874

約数の個数: 32

約数和(自身を含む): 55290816

約数和(自身を除く): 33898926

約数列:

[1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390, 54851, 109702, 164553, 274255, 329106, 548510, 713063, 822765, 1426126, 1645530, 2139189, 3565315, 4278378, 7130630, 10695945, 21391890]

約数ペア:

[(1, 21391890), (2, 10695945), (3, 7130630), (5, 4278378), (6, 3565315), (10, 2139189), (13, 1645530), (15, 1426126), (26, 822765), (30, 713063), (39, 548510), (65, 329106), (78, 274255), (130, 164553), (195, 109702), (390, 54851)]