20957720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{29}}^2\times {\mathrm{89}}^1$

素因数の和:165

約数の個数: 96

約数和(自身を含む): 56440800

約数和(自身を除く): 35483080

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 29, 35, 40, 56, 58, 70, 89, 116, 140, 145, 178, 203, 232, 280, 290, 356, 406, 445, 580, 623, 712, 812, 841, 890, 1015, 1160, 1246, 1624, 1682, 1780, 2030, 2492, 2581, 3115, 3364, 3560, 4060, 4205, 4984, 5162, 5887, 6230, 6728, 8120, 8410, 10324, 11774, 12460, 12905, 16820, 18067, 20648, 23548, 24920, 25810, 29435, 33640, 36134, 47096, 51620, 58870, 72268, 74849, 90335, 103240, 117740, 144536, 149698, 180670, 235480, 299396, 361340, 374245, 523943, 598792, 722680, 748490, 1047886, 1496980, 2095772, 2619715, 2993960, 4191544, 5239430, 10478860, 20957720]

約数ペア:

[(1, 20957720), (2, 10478860), (4, 5239430), (5, 4191544), (7, 2993960), (8, 2619715), (10, 2095772), (14, 1496980), (20, 1047886), (28, 748490), (29, 722680), (35, 598792), (40, 523943), (56, 374245), (58, 361340), (70, 299396), (89, 235480), (116, 180670), (140, 149698), (145, 144536), (178, 117740), (203, 103240), (232, 90335), (280, 74849), (290, 72268), (356, 58870), (406, 51620), (445, 47096), (580, 36134), (623, 33640), (712, 29435), (812, 25810), (841, 24920), (890, 23548), (1015, 20648), (1160, 18067), (1246, 16820), (1624, 12905), (1682, 12460), (1780, 11774), (2030, 10324), (2492, 8410), (2581, 8120), (3115, 6728), (3364, 6230), (3560, 5887), (4060, 5162), (4205, 4984)]