21481840

素因数分解:

$2^4\times 5^1\times {\mathrm{263}}^1\times {\mathrm{1021}}^1$

素因数の和:1297

約数の個数: 40

約数和(自身を含む): 50184288

約数和(自身を除く): 28702448

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263, 526, 1021, 1052, 1315, 2042, 2104, 2630, 4084, 4208, 5105, 5260, 8168, 10210, 10520, 16336, 20420, 21040, 40840, 81680, 268523, 537046, 1074092, 1342615, 2148184, 2685230, 4296368, 5370460, 10740920, 21481840]

約数ペア:

[(1, 21481840), (2, 10740920), (4, 5370460), (5, 4296368), (8, 2685230), (10, 2148184), (16, 1342615), (20, 1074092), (40, 537046), (80, 268523), (263, 81680), (526, 40840), (1021, 21040), (1052, 20420), (1315, 16336), (2042, 10520), (2104, 10210), (2630, 8168), (4084, 5260), (4208, 5105)]