20908790

素因数分解:

$2^1\times 5^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{601}}^1$

素因数の和:693

約数の個数: 48

約数和(自身を含む): 44470944

約数和(自身を除く): 23562154

約数列:

[1, 2, 5, 7, 10, 14, 35, 49, 70, 71, 98, 142, 245, 355, 490, 497, 601, 710, 994, 1202, 2485, 3005, 3479, 4207, 4970, 6010, 6958, 8414, 17395, 21035, 29449, 34790, 42070, 42671, 58898, 85342, 147245, 213355, 294490, 298697, 426710, 597394, 1493485, 2090879, 2986970, 4181758, 10454395, 20908790]

約数ペア:

[(1, 20908790), (2, 10454395), (5, 4181758), (7, 2986970), (10, 2090879), (14, 1493485), (35, 597394), (49, 426710), (70, 298697), (71, 294490), (98, 213355), (142, 147245), (245, 85342), (355, 58898), (490, 42671), (497, 42070), (601, 34790), (710, 29449), (994, 21035), (1202, 17395), (2485, 8414), (3005, 6958), (3479, 6010), (4207, 4970)]