20421730

素因数分解:

$2^1\times 5^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{587}}^1$

素因数の和:679

約数の個数: 48

約数和(自身を含む): 43436736

約数和(自身を除く): 23015006

約数列:

[1, 2, 5, 7, 10, 14, 35, 49, 70, 71, 98, 142, 245, 355, 490, 497, 587, 710, 994, 1174, 2485, 2935, 3479, 4109, 4970, 5870, 6958, 8218, 17395, 20545, 28763, 34790, 41090, 41677, 57526, 83354, 143815, 208385, 287630, 291739, 416770, 583478, 1458695, 2042173, 2917390, 4084346, 10210865, 20421730]

約数ペア:

[(1, 20421730), (2, 10210865), (5, 4084346), (7, 2917390), (10, 2042173), (14, 1458695), (35, 583478), (49, 416770), (70, 291739), (71, 287630), (98, 208385), (142, 143815), (245, 83354), (355, 57526), (490, 41677), (497, 41090), (587, 34790), (710, 28763), (994, 20545), (1174, 17395), (2485, 8218), (2935, 6958), (3479, 5870), (4109, 4970)]