21685880

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31891}}^1$

素因数の和:31919

約数の個数: 32

約数和(自身を含む): 51665040

約数和(自身を除く): 29979160

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680, 31891, 63782, 127564, 159455, 255128, 318910, 542147, 637820, 1084294, 1275640, 2168588, 2710735, 4337176, 5421470, 10842940, 21685880]

約数ペア:

[(1, 21685880), (2, 10842940), (4, 5421470), (5, 4337176), (8, 2710735), (10, 2168588), (17, 1275640), (20, 1084294), (34, 637820), (40, 542147), (68, 318910), (85, 255128), (136, 159455), (170, 127564), (340, 63782), (680, 31891)]