81234320

素因数分解:

$2^4\times 5^1\times {\mathrm{521}}^1\times {\mathrm{1949}}^1$

素因数の和:2483

約数の個数: 40

約数和(自身を含む): 189329400

約数和(自身を除く): 108095080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 521, 1042, 1949, 2084, 2605, 3898, 4168, 5210, 7796, 8336, 9745, 10420, 15592, 19490, 20840, 31184, 38980, 41680, 77960, 155920, 1015429, 2030858, 4061716, 5077145, 8123432, 10154290, 16246864, 20308580, 40617160, 81234320]

約数ペア:

[(1, 81234320), (2, 40617160), (4, 20308580), (5, 16246864), (8, 10154290), (10, 8123432), (16, 5077145), (20, 4061716), (40, 2030858), (80, 1015429), (521, 155920), (1042, 77960), (1949, 41680), (2084, 38980), (2605, 31184), (3898, 20840), (4168, 19490), (5210, 15592), (7796, 10420), (8336, 9745)]