21915790

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{263}}^1\times {\mathrm{641}}^1$

素因数の和:924

約数の個数: 32

約数和(自身を含む): 42710976

約数和(自身を除く): 20795186

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 263, 526, 641, 1282, 1315, 2630, 3205, 3419, 6410, 6838, 8333, 16666, 17095, 34190, 41665, 83330, 168583, 337166, 842915, 1685830, 2191579, 4383158, 10957895, 21915790]

約数ペア:

[(1, 21915790), (2, 10957895), (5, 4383158), (10, 2191579), (13, 1685830), (26, 842915), (65, 337166), (130, 168583), (263, 83330), (526, 41665), (641, 34190), (1282, 17095), (1315, 16666), (2630, 8333), (3205, 6838), (3419, 6410)]