19810928

素因数分解:

$2^4\times {\mathrm{251}}^1\times {\mathrm{4933}}^1$

素因数の和:5192

約数の個数: 20

約数和(自身を含む): 38544408

約数和(自身を除く): 18733480

約数列:

[1, 2, 4, 8, 16, 251, 502, 1004, 2008, 4016, 4933, 9866, 19732, 39464, 78928, 1238183, 2476366, 4952732, 9905464, 19810928]

約数ペア:

[(1, 19810928), (2, 9905464), (4, 4952732), (8, 2476366), (16, 1238183), (251, 78928), (502, 39464), (1004, 19732), (2008, 9866), (4016, 4933)]