21881380

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{139}}^1\times {\mathrm{463}}^1$

素因数の和:628

約数の個数: 48

約数和(自身を含む): 49109760

約数和(自身を除く): 27228380

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 139, 170, 278, 340, 463, 556, 695, 926, 1390, 1852, 2315, 2363, 2780, 4630, 4726, 7871, 9260, 9452, 11815, 15742, 23630, 31484, 39355, 47260, 64357, 78710, 128714, 157420, 257428, 321785, 643570, 1094069, 1287140, 2188138, 4376276, 5470345, 10940690, 21881380]

約数ペア:

[(1, 21881380), (2, 10940690), (4, 5470345), (5, 4376276), (10, 2188138), (17, 1287140), (20, 1094069), (34, 643570), (68, 321785), (85, 257428), (139, 157420), (170, 128714), (278, 78710), (340, 64357), (463, 47260), (556, 39355), (695, 31484), (926, 23630), (1390, 15742), (1852, 11815), (2315, 9452), (2363, 9260), (2780, 7871), (4630, 4726)]