17981780

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{21929}}^1$

素因数の和:21979

約数の個数: 24

約数和(自身を含む): 38684520

約数和(自身を除く): 20702740

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 21929, 43858, 87716, 109645, 219290, 438580, 899089, 1798178, 3596356, 4495445, 8990890, 17981780]

約数ペア:

[(1, 17981780), (2, 8990890), (4, 4495445), (5, 3596356), (10, 1798178), (20, 899089), (41, 438580), (82, 219290), (164, 109645), (205, 87716), (410, 43858), (820, 21929)]