20989730

素因数分解:

$2^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{71}}^1$

素因数の和:179

約数の個数: 64

約数和(自身を含む): 42550272

約数和(自身を除く): 21560542

約数列:

[1, 2, 5, 10, 17, 34, 37, 47, 71, 74, 85, 94, 142, 170, 185, 235, 355, 370, 470, 629, 710, 799, 1207, 1258, 1598, 1739, 2414, 2627, 3145, 3337, 3478, 3995, 5254, 6035, 6290, 6674, 7990, 8695, 12070, 13135, 16685, 17390, 26270, 29563, 33370, 44659, 56729, 59126, 89318, 113458, 123469, 147815, 223295, 246938, 283645, 295630, 446590, 567290, 617345, 1234690, 2098973, 4197946, 10494865, 20989730]

約数ペア:

[(1, 20989730), (2, 10494865), (5, 4197946), (10, 2098973), (17, 1234690), (34, 617345), (37, 567290), (47, 446590), (71, 295630), (74, 283645), (85, 246938), (94, 223295), (142, 147815), (170, 123469), (185, 113458), (235, 89318), (355, 59126), (370, 56729), (470, 44659), (629, 33370), (710, 29563), (799, 26270), (1207, 17390), (1258, 16685), (1598, 13135), (1739, 12070), (2414, 8695), (2627, 7990), (3145, 6674), (3337, 6290), (3478, 6035), (3995, 5254)]