20511700

素因数分解:

$2^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{643}}^1$

素因数の和:697

約数の個数: 72

約数和(自身を含む): 50309280

約数和(自身を除く): 29797580

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 25, 29, 44, 50, 55, 58, 100, 110, 116, 145, 220, 275, 290, 319, 550, 580, 638, 643, 725, 1100, 1276, 1286, 1450, 1595, 2572, 2900, 3190, 3215, 6380, 6430, 7073, 7975, 12860, 14146, 15950, 16075, 18647, 28292, 31900, 32150, 35365, 37294, 64300, 70730, 74588, 93235, 141460, 176825, 186470, 205117, 353650, 372940, 410234, 466175, 707300, 820468, 932350, 1025585, 1864700, 2051170, 4102340, 5127925, 10255850, 20511700]

約数ペア:

[(1, 20511700), (2, 10255850), (4, 5127925), (5, 4102340), (10, 2051170), (11, 1864700), (20, 1025585), (22, 932350), (25, 820468), (29, 707300), (44, 466175), (50, 410234), (55, 372940), (58, 353650), (100, 205117), (110, 186470), (116, 176825), (145, 141460), (220, 93235), (275, 74588), (290, 70730), (319, 64300), (550, 37294), (580, 35365), (638, 32150), (643, 31900), (725, 28292), (1100, 18647), (1276, 16075), (1286, 15950), (1450, 14146), (1595, 12860), (2572, 7975), (2900, 7073), (3190, 6430), (3215, 6380)]