19720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1$

素因数の和:57

約数の個数: 32

約数和(自身を含む): 48600

約数和(自身を除く): 28880

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 29, 34, 40, 58, 68, 85, 116, 136, 145, 170, 232, 290, 340, 493, 580, 680, 986, 1160, 1972, 2465, 3944, 4930, 9860, 19720]

約数ペア:

[(1, 19720), (2, 9860), (4, 4930), (5, 3944), (8, 2465), (10, 1972), (17, 1160), (20, 986), (29, 680), (34, 580), (40, 493), (58, 340), (68, 290), (85, 232), (116, 170), (136, 145)]