20728780

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{1487}}^1$

素因数の和:1554

約数の個数: 48

約数和(自身を含む): 47246976

約数和(自身を除く): 26518196

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 41, 68, 82, 85, 164, 170, 205, 340, 410, 697, 820, 1394, 1487, 2788, 2974, 3485, 5948, 6970, 7435, 13940, 14870, 25279, 29740, 50558, 60967, 101116, 121934, 126395, 243868, 252790, 304835, 505580, 609670, 1036439, 1219340, 2072878, 4145756, 5182195, 10364390, 20728780]

約数ペア:

[(1, 20728780), (2, 10364390), (4, 5182195), (5, 4145756), (10, 2072878), (17, 1219340), (20, 1036439), (34, 609670), (41, 505580), (68, 304835), (82, 252790), (85, 243868), (164, 126395), (170, 121934), (205, 101116), (340, 60967), (410, 50558), (697, 29740), (820, 25279), (1394, 14870), (1487, 13940), (2788, 7435), (2974, 6970), (3485, 5948)]