18971920

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{21559}}^1$

素因数の和:21583

約数の個数: 40

約数和(自身を含む): 48121920

約数和(自身を除く): 29150000

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 110, 176, 220, 440, 880, 21559, 43118, 86236, 107795, 172472, 215590, 237149, 344944, 431180, 474298, 862360, 948596, 1185745, 1724720, 1897192, 2371490, 3794384, 4742980, 9485960, 18971920]

約数ペア:

[(1, 18971920), (2, 9485960), (4, 4742980), (5, 3794384), (8, 2371490), (10, 1897192), (11, 1724720), (16, 1185745), (20, 948596), (22, 862360), (40, 474298), (44, 431180), (55, 344944), (80, 237149), (88, 215590), (110, 172472), (176, 107795), (220, 86236), (440, 43118), (880, 21559)]