21990110

素因数分解:

$2^1\times 5^1\times {\mathrm{251}}^1\times {\mathrm{8761}}^1$

素因数の和:9019

約数の個数: 16

約数和(自身を含む): 39744432

約数和(自身を除く): 17754322

約数列:

[1, 2, 5, 10, 251, 502, 1255, 2510, 8761, 17522, 43805, 87610, 2199011, 4398022, 10995055, 21990110]

約数ペア:

[(1, 21990110), (2, 10995055), (5, 4398022), (10, 2199011), (251, 87610), (502, 43805), (1255, 17522), (2510, 8761)]