21551908

素因数分解:

$2^2\times 7^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{293}}^1$

素因数の和:412

約数の個数: 48

約数和(自身を含む): 45045504

約数和(自身を除く): 23493596

約数列:

[1, 2, 4, 7, 14, 28, 37, 71, 74, 142, 148, 259, 284, 293, 497, 518, 586, 994, 1036, 1172, 1988, 2051, 2627, 4102, 5254, 8204, 10508, 10841, 18389, 20803, 21682, 36778, 41606, 43364, 73556, 75887, 83212, 145621, 151774, 291242, 303548, 582484, 769711, 1539422, 3078844, 5387977, 10775954, 21551908]

約数ペア:

[(1, 21551908), (2, 10775954), (4, 5387977), (7, 3078844), (14, 1539422), (28, 769711), (37, 582484), (71, 303548), (74, 291242), (142, 151774), (148, 145621), (259, 83212), (284, 75887), (293, 73556), (497, 43364), (518, 41606), (586, 36778), (994, 21682), (1036, 20803), (1172, 18389), (1988, 10841), (2051, 10508), (2627, 8204), (4102, 5254)]