21408680

素因数分解:

$2^3\times 5^1\times {\mathrm{181}}^1\times {\mathrm{2957}}^1$

素因数の和:3149

約数の個数: 32

約数和(自身を含む): 48452040

約数和(自身を除く): 27043360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 181, 362, 724, 905, 1448, 1810, 2957, 3620, 5914, 7240, 11828, 14785, 23656, 29570, 59140, 118280, 535217, 1070434, 2140868, 2676085, 4281736, 5352170, 10704340, 21408680]

約数ペア:

[(1, 21408680), (2, 10704340), (4, 5352170), (5, 4281736), (8, 2676085), (10, 2140868), (20, 1070434), (40, 535217), (181, 118280), (362, 59140), (724, 29570), (905, 23656), (1448, 14785), (1810, 11828), (2957, 7240), (3620, 5914)]