21091408

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{3271}}^1$

素因数の和:3323

約数の個数: 40

約数和(自身を含む): 45441536

約数和(自身を除く): 24350128

約数列:

[1, 2, 4, 8, 13, 16, 26, 31, 52, 62, 104, 124, 208, 248, 403, 496, 806, 1612, 3224, 3271, 6448, 6542, 13084, 26168, 42523, 52336, 85046, 101401, 170092, 202802, 340184, 405604, 680368, 811208, 1318213, 1622416, 2636426, 5272852, 10545704, 21091408]

約数ペア:

[(1, 21091408), (2, 10545704), (4, 5272852), (8, 2636426), (13, 1622416), (16, 1318213), (26, 811208), (31, 680368), (52, 405604), (62, 340184), (104, 202802), (124, 170092), (208, 101401), (248, 85046), (403, 52336), (496, 42523), (806, 26168), (1612, 13084), (3224, 6542), (3271, 6448)]