20728960

素因数分解:

$2^7\times 5^1\times 7^2\times {\mathrm{661}}^1$

素因数の和:694

約数の個数: 96

約数和(自身を含む): 57733020

約数和(自身を除く): 37004060

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 49, 56, 64, 70, 80, 98, 112, 128, 140, 160, 196, 224, 245, 280, 320, 392, 448, 490, 560, 640, 661, 784, 896, 980, 1120, 1322, 1568, 1960, 2240, 2644, 3136, 3305, 3920, 4480, 4627, 5288, 6272, 6610, 7840, 9254, 10576, 13220, 15680, 18508, 21152, 23135, 26440, 31360, 32389, 37016, 42304, 46270, 52880, 64778, 74032, 84608, 92540, 105760, 129556, 148064, 161945, 185080, 211520, 259112, 296128, 323890, 370160, 423040, 518224, 592256, 647780, 740320, 1036448, 1295560, 1480640, 2072896, 2591120, 2961280, 4145792, 5182240, 10364480, 20728960]

約数ペア:

[(1, 20728960), (2, 10364480), (4, 5182240), (5, 4145792), (7, 2961280), (8, 2591120), (10, 2072896), (14, 1480640), (16, 1295560), (20, 1036448), (28, 740320), (32, 647780), (35, 592256), (40, 518224), (49, 423040), (56, 370160), (64, 323890), (70, 296128), (80, 259112), (98, 211520), (112, 185080), (128, 161945), (140, 148064), (160, 129556), (196, 105760), (224, 92540), (245, 84608), (280, 74032), (320, 64778), (392, 52880), (448, 46270), (490, 42304), (560, 37016), (640, 32389), (661, 31360), (784, 26440), (896, 23135), (980, 21152), (1120, 18508), (1322, 15680), (1568, 13220), (1960, 10576), (2240, 9254), (2644, 7840), (3136, 6610), (3305, 6272), (3920, 5288), (4480, 4627)]