21821355

素因数分解:

$3^2\times 5^1\times {\mathrm{173}}^1\times {\mathrm{2803}}^1$

素因数の和:2987

約数の個数: 24

約数和(自身を含む): 38055888

約数和(自身を除く): 16234533

約数列:

[1, 3, 5, 9, 15, 45, 173, 519, 865, 1557, 2595, 2803, 7785, 8409, 14015, 25227, 42045, 126135, 484919, 1454757, 2424595, 4364271, 7273785, 21821355]

約数ペア:

[(1, 21821355), (3, 7273785), (5, 4364271), (9, 2424595), (15, 1454757), (45, 484919), (173, 126135), (519, 42045), (865, 25227), (1557, 14015), (2595, 8409), (2803, 7785)]